[gdal-dev] GDAL C# Bindings: How to implement callback
Dear All,
I have called below GDAL function with callback, not getting the call to
callback function?
var newDs = Gdal.wrapper_GDALVectorTranslateDestName(output, ds,
gdalOptions, new Gdal.GDALProgressFuncDelegate(ProgressFunc), null);
public static int ProgressFunc(double Complete, IntPtr Message, IntPtr
Data)
{
}
How to know that this call is complete?
Regards,
Rajesh
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[gdal-dev] GDAL C# bindings, read from /vsimem/
Hi list, first time poster here.
I'm using the GDAL C# bindings in .net core via the Gdal.Core Nuget package
(https://www.nuget.org/packages/Gdal.Core/)
Everyting seems to work fine, apart from the fact that I have to touch the file
system in order to get my created GeoTiff as a memory stream
Sample code:
var outputRasterFileName = $"{Path.GetTempPath()}{Guid.NewGuid()}.tiff";
var driver = Gdal.GetDriverByName("GTiff");
var ds = driver.Create(outputRasterFileName, resolution.X, resolution.Y, 1,
DataType.GDT_Byte, null);
SetSrsFromLayer(ds, layer);
var arg = new[] { envelope.MinX, pixelSize, 0, envelope.MinY, 0, pixelSize };
ds.SetGeoTransform(arg);
var band = ds.GetRasterBand(1);
band.SetNoDataValue(noDataValue);
band.FlushCache();
var rasterizeOptions = new[] { "ALL_TOUCHED=TRUE" };
Gdal.RasterizeLayer(ds, 1, new[] { 1 }, layer, IntPtr.Zero, IntPtr.Zero, 1,
new[] { 10.0 }, rasterizeOptions, null, null);
ds.FlushCache();
var destination = new MemoryStream();
using (var source = File.Open(outputRasterFileName, FileMode.Open))
{
source.CopyTo(destination);
destination.Position = 0;
return destination;
}
This works, but I do not like the idea of writing to disk when I don't have to.
I then found these threads:
http://osgeo-org.1560.x6.nabble.com/gdal-dev-NET-and-OGR-writing-to-stream-td3744067.html#a3744070
https://lists.osgeo.org/pipermail/gdal-dev/2016-August/045030.html
Which says I can use the memory file system handler, and the python sample code
provided by Even seems easy enough to translate:
# Read /vsimem/output.png
f = gdal.VSIFOpenL('/vsimem/output.png', 'rb')
gdal.VSIFSeekL(f, 0, 2) # seek to end
size = gdal.VSIFTellL(f)
gdal.VSIFSeekL(f, 0, 0) # seek to beginning
data = gdal.VSIFReadL(1, size, f)
gdal.VSIFCloseL(f)
# Cleanup
gdal.Unlink('/vsimem/output.png')
However, the C# bindings does not seem to include VSIFReadL, although Maksim
Sestic seems to indicate that they are.
Is this an issue with the Nuget-package?
I then tried using C# Marshal.Copy, but this fails:
var bufPtr = Gdal.VSIFOpenL(outputRasterFileName, "rb");
//outputRasterFileName is now "/vsimem/file.tiff"
Gdal.VSIFSeekL(bufPtr, 0, 2); // seek to end
var size = Gdal.VSIFTellL(bufPtr);
Gdal.VSIFSeekL(bufPtr, 0, 0); // seek to beginning
Gdal.VSIFCloseL(bufPtr);
var data = new byte[size];
Marshal.Copy(bufPtr, data, 0, size);
Gdal.Unlink(outputRasterFileName);
I am by no means a C# expert, but I cannot see any reason this should fail?
Given a memory pointer and size, read bytes, right?
As a last alternative I've tried to use the examples provided here:
https://trac.osgeo.org/gdal/browser/trunk/gdal/swig/csharp/apps/GDALReadDirect.cs
This lets me read the bitmap of my raster, but all geotiff-metadata is lost.
This also seems a bit overkill, as the actual GeoTiff is created and exists in
memory!
So, to sum up a large mail:
1. Should Gdal.VSIFReadL be available in the C# bindings? If so, how do I get
them?
2. If not 1, Should I be able to use Marshal.Copy in the manner described
above? Or are there any other ways of getting these bytes?
3. If not 2, is using the sample code in
https://trac.osgeo.org/gdal/browser/trunk/gdal/swig/csharp/apps/GDALReadDirect.cs
a feasible way to create a stream of a geotiff-file`?
Thanks in advance for your replies, and thanks for a great library!
-a
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Atle Frenvik Sveen
a...@frenviksveen.net
45278689
atlefren.net
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Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
ChiefDan ChiefDan at gmail.com writes: Jukka Rahkonen wrote Hi, Could you make a drawing about what you have and what you want to get? If your aim is to cut long linestrings only where they intersect with points from the point layer I believe that it is not easy with plain GDAL. There are some useful functions in the SQLite/Spatialite SQL dialect https://www.gaia-gis.it/gaia-sins/xmlBlob/spatialite-sql-latest.html, like LinesCutAtNodes and Snap if you lines are only close to vertex a a linestring. LinesCutAtNodes is making multilinestrings so you should continue with something like the -explodecollections option in ogr2ogr. -Jukka Rahkonen- --I'm thinking to have a network of point-line-points for path finding. Pick any one of the green points above, I need to create line segments from that point to any point in any direction on the line that point is on to the next point. In the end, the layers would visualize in the same manner, however the original line(s) would now have end points at those green points. I'll look into Spatialite, I knew it had networking api as well. Hi, I did not mean that you should use Spatialite instead of GDAL but that you can utilize all that is supported by spatialite with GDAL through the SQLite SQL dialect http://www.gdal.org/ogr_sql_sqlite.html. Thanks for the image which I saw by accident from the Nabble thread. It does not appear in any way gmane which I usually use for reading the mails. You seem to be interested in on which track trains are standing. How about this plan: Cut all the linestrings which present tracks to reasonably short segments. Trains are long so perhaps segments could be about 200 meters or even longer. You can do the densification with ogr2ogr -segmentize 200. Build the routing graph based on this segmentized data. When you start routing you could now - Select the segment that is closest to your train - Select the start point/end point of that segment to be used as node_from/node_to for your routing algorithm. Because segments can be 200 m long the selected start/end node can be nearly 200 meters away from the reference point but because trains and platforms are so long that should not matter so much. After all, both the first and last car in a train are following the same route. -Jukka Rahkonen- ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
ChiefDan ChiefDan at gmail.com writes: Jukka, THanks for the suggestions. THe green points are the decision points, so I need to use those in my pathing. For instance, I would choose one of those points and then choose another green point as the destination to get the route(s). I have not really done anything useful with routing so my thinking may be all wrong. I was thinking that there is a green point A on top of segment P, and another green point B on top of R and you want to go from A to B. If you select the start point of P and end point of R and compute a route between them, doesn't the route necessarily go also via A and B? Splitting the line segments from the middle at exact locations of A and B would not make any real change into the graph and routing because new nodes would be only pass-through nodes with cardinality of 2. -Jukka Rahkonen- ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
Jukka, THanks for the suggestions. THe green points are the decision points, so I need to use those in my pathing. For instance, I would choose one of those points and then choose another green point as the destination to get the route(s). -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195426.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
Jukka, I've not done anything useful with routing either, so I'm sure once I solve my issue, I'll immediately realize a simpler way to do it. Your segmenting the lines has given me an idea that is similar: Add the points into the linestrings. I think if I do this I can then more easily create line segments with the start/end points at my green points. Given a point, I can then determine which line it is on. Once I have that line, I can loop through the points that make up that line until I find my first point of interest. From that point in the line string I can then iterate to the next point in the linestring, then search for that point in my points layer. If I find it, that's a line segment. THe complication will then be finding the next green point on an intersecting linestring. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195438.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
Jukka Rahkonen wrote Hi, Could you make a drawing about what you have and what you want to get? If your aim is to cut long linestrings only where they intersect with points from the point layer I believe that it is not easy with plain GDAL. There are some useful functions in the SQLite/Spatialite SQL dialect https://www.gaia-gis.it/gaia-sins/xmlBlob/spatialite-sql-latest.html, like LinesCutAtNodes and Snap if you lines are only close to vertex a a linestring. LinesCutAtNodes is making multilinestrings so you should continue with something like the -explodecollections option in ogr2ogr. -Jukka Rahkonen- --I'm thinking to have a network of point-line-points for path finding. Pick any one of the green points above, I need to create line segments from that point to any point in any direction on the line that point is on to the next point. In the end, the layers would visualize in the same manner, however the original line(s) would now have end points at those green points. I'll look into Spatialite, I knew it had networking api as well. Dan -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195274.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
Matt Hanson-2 wrote So you've got a series of points in your point layer, and a series of lines in your line layer, and for each point on your points layer, you want to find out which line this falls on. --I'm able to do this already. Matt Hanson-2 wrote Is that right? It sounds like you've done this part. However, I'm not sure what is meant. Is there an exact matching point on the line (i.e. same exact coordinates), or are you finding the line that the point falls on (using some sort of buffer or tolerance)? --If you look at the picture above, those points are on the lines, but there is not necessarily a corresponding point in the linestring, most likely there is not. Matt Hanson-2 wrote If you are just finding the line that it happens to fall on, (I think this is what you meant by not end points), then are you finding the closest point that actually is part of the line? --I'm thinking to have a network of point-line-points for path finding. Pick any one of the green points above, I need to create line segments from that point to any point in any direction on the line that point is on to the next point. In the end, the layers would visualize in the same manner, however the original line(s) would now have end points at those green points. Matt Hanson-2 wrote If you have found the closest point on the line, then from there I think it's easy to walk up and down the line by retrieving the points in order. However, if you currently only have the linestring and the point coordinates then use distance to find the actual closest on-line point. Do I have this mostly right or have I only managed to confuse things more? --I'm sure I am not explaining it well as this is my first foray into path finding and preparing the data so far has been the most difficult part. I'm not fluent in GIS either so I think I'm lacking in proper vocabulary. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195273.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
ChiefDan, If I understand the problem correctly... If you get the OGRGeometry of your line string (get the WKT from that or somehow turn into an array or list that is easy to work with) you will have all the points in order along the line. Then, you'll need to find your initial point of interest. Once you find that match you can traverse up or down the array. matt On Tue, Mar 24, 2015 at 5:09 AM, ChiefDan chief...@gmail.com wrote: Yes, I've experimented with that library and actually asked a follow up question here about it. To properly use it, I need to prepare the layer in the manner I am asking about. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195113.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
Yes, I've experimented with that library and actually asked a follow up question here about it. To properly use it, I need to prepare the layer in the manner I am asking about. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195113.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
Want to make sure I understand this properly. So you've got a series of points in your point layer, and a series of lines in your line layer, and for each point on your points layer, you want to find out which line this falls on. Is that right? It sounds like you've done this part. However, I'm not sure what is meant. Is there an exact matching point on the line (i.e. same exact coordinates), or are you finding the line that the point falls on (using some sort of buffer or tolerance)? If you are just finding the line that it happens to fall on, (I think this is what you meant by not end points), then are you finding the closest point that actually is part of the line? If you have found the closest point on the line, then from there I think it's easy to walk up and down the line by retrieving the points in order. However, if you currently only have the linestring and the point coordinates then use distance to find the actual closest on-line point. Do I have this mostly right or have I only managed to confuse things more? On Tue, Mar 24, 2015 at 2:11 PM, ChiefDan chief...@gmail.com wrote: Matt, I've got a line layer and a points layer. The points layer fall on the line layer, however they are not end points on the line layer, for the most part. I'm not sure if that answers your question or not. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195238.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
ChiefDan ChiefDan at gmail.com writes: Matt, I've got a line layer and a points layer. The points layer fall on the line layer, however they are not end points on the line layer, for the most part. I'm not sure if that answers your question or not. Hi, Could you make a drawing about what you have and what you want to get? If your aim is to cut long linestrings only where they intersect with points from the point layer I believe that it is not easy with plain GDAL. There are some useful functions in the SQLite/Spatialite SQL dialect https://www.gaia-gis.it/gaia-sins/xmlBlob/spatialite-sql-latest.html, like LinesCutAtNodes and Snap if you lines are only close to vertex a a linestring. LinesCutAtNodes is making multilinestrings so you should continue with something like the -explodecollections option in ogr2ogr. -Jukka Rahkonen- ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
Matt, I've got a line layer and a points layer. The points layer fall on the line layer, however they are not end points on the line layer, for the most part. I'm not sure if that answers your question or not. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195238.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] GDAL C++ Api, create new line segments from point layer
I am trying to create a pathfinding graph from a shapefile with a line layer and point layer. Using the C++ API, for each point in the points layer, I need to find the next N points that are connected to that point along one or more OGRLineStrings. I've been able to determine which OGRLineString in the OGRMultiLineString a point from the points layer is on. I'd be creating new line segments with these neighboring points as the start/end point and this would be the path pair for the pathing as well. I am not sure how to determine what point(s) from the points layer are next on the line. Using the Distance() to compare won't work since a point could be within the radius, but not on a line that would directly connect the 2 points. I appreciate any pointers. Dan -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C++ Api, create new line segments from point layer
Would GEOS be a more appropriate library to use? GDAL was my goto due to familiarity. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-C-Api-create-new-line-segments-from-point-layer-tp5195061p5195070.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C# bindings - using rasterlite and spatialite in the same database
Le mardi 25 février 2014 18:12:55, Marcel Gangwisch a écrit : Hi *, I use the following command: rasterliteDriver.CreateCopy(RASTERLITE:GeoDatabase.db,TABLE=raster_test, source, 1, options, null, null); to read every gdal raster in my rasterlite database. After reading I'm also able to read another raster of vector file into the sqlite database. Everything works fine. My Problem is now if I do this the other way around: Then I first read a vector file into a spatialite database, and after that I want to read a raster file into the same database I get the following exception: does not exist in the file system, and is not recognised as a supported dataset name Does anybody know what I'm doing wrong? Marcel, You should provide something more precise to reproduce. I've tested successfully the equivalent operations of what I've understood of your above description with the following command lines : ogr2ogr -f sqlite poly.sqlite poly.shp -dsco spatialite=yes gdal_translate -of rasterlite byte.tif RASTERLITE:poly.sqlite,TABLE=byte and then both ogrinfo and gdalinfo show the vector and raster layers. Even -- Geospatial professional services http://even.rouault.free.fr/services.html ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C# bindings - using rasterlite and spatialite in the same database
Dear Even, thank you for your answer! I think I know the real problem now. Respectively Sandro (I think a developer of rasterlite) gave me the correct hint. (https://groups.google.com/forum/?hl=de#!topic/spatialite-users/g8b3va_zteg https://groups.google.com/forum/?hl=de#%21topic/spatialite-users/g8b3va_zteg) For the generation of the spatialite database I used spatialite 4.0... But the precompiled gdal version (http://vbkto.dyndns.org:1280/sdk/) I used, uses spatialite 3.0... I checked that, with the spatialite-gui. So like Sandro wrote: /in this case a new style DB-file will be created in the first step; // //but librasterlite hasn't the capability to access new style DB-files, // //so any further attempt to import some raster data will then fail. / The Question is now, what to do... Obviously I want to use the newest spatialite version. Therefore I thinking about building gdal against spatialite 4. On the other side, Sandro wrote, that rasterlite 2 will be coming soon. So maybe I just stay on spatialite version 3. And use later version 4. Best regards, Marcel Am 27.02.2014 20:23, schrieb Even Rouault: Le mardi 25 février 2014 18:12:55, Marcel Gangwisch a écrit : Hi *, I use the following command: rasterliteDriver.CreateCopy(RASTERLITE:GeoDatabase.db,TABLE=raster_test, source, 1, options, null, null); to read every gdal raster in my rasterlite database. After reading I'm also able to read another raster of vector file into the sqlite database. Everything works fine. My Problem is now if I do this the other way around: Then I first read a vector file into a spatialite database, and after that I want to read a raster file into the same database I get the following exception: does not exist in the file system, and is not recognised as a supported dataset name Does anybody know what I'm doing wrong? Marcel, You should provide something more precise to reproduce. I've tested successfully the equivalent operations of what I've understood of your above description with the following command lines : ogr2ogr -f sqlite poly.sqlite poly.shp -dsco spatialite=yes gdal_translate -of rasterlite byte.tif RASTERLITE:poly.sqlite,TABLE=byte and then both ogrinfo and gdalinfo show the vector and raster layers. Even ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C# bindings - using rasterlite and spatialite in the same database
Le jeudi 27 février 2014 21:39:52, Marcel Gangwisch a écrit : Dear Even, thank you for your answer! I think I know the real problem now. Respectively Sandro (I think a developer of rasterlite) gave me the correct hint. (https://groups.google.com/forum/?hl=de#!topic/spatialite-users/g8b3va_zteg https://groups.google.com/forum/?hl=de#%21topic/spatialite-users/g8b3va_zt eg) For the generation of the spatialite database I used spatialite 4.0... But the precompiled gdal version (http://vbkto.dyndns.org:1280/sdk/) I used, uses spatialite 3.0... I checked that, with the spatialite-gui. I doubt this is the reason. GDAL doesn't use librasterlite code. So when you stay with GDAL/OGR utilities, that should work. Of course the problem is that rasterlite DBs produced by GDAL may not work correctly with spatialite utilities. So like Sandro wrote: /in this case a new style DB-file will be created in the first step; // //but librasterlite hasn't the capability to access new style DB-files, // //so any further attempt to import some raster data will then fail. / The Question is now, what to do... Obviously I want to use the newest spatialite version. Therefore I thinking about building gdal against spatialite 4. On the other side, Sandro wrote, that rasterlite 2 will be coming soon. So maybe I just stay on spatialite version 3. And use later version 4. Best regards, Marcel Am 27.02.2014 20:23, schrieb Even Rouault: Le mardi 25 février 2014 18:12:55, Marcel Gangwisch a écrit : Hi *, I use the following command: rasterliteDriver.CreateCopy(RASTERLITE:GeoDatabase.db,TABLE=raster_test , source, 1, options, null, null); to read every gdal raster in my rasterlite database. After reading I'm also able to read another raster of vector file into the sqlite database. Everything works fine. My Problem is now if I do this the other way around: Then I first read a vector file into a spatialite database, and after that I want to read a raster file into the same database I get the following exception: does not exist in the file system, and is not recognised as a supported dataset name Does anybody know what I'm doing wrong? Marcel, You should provide something more precise to reproduce. I've tested successfully the equivalent operations of what I've understood of your above description with the following command lines : ogr2ogr -f sqlite poly.sqlite poly.shp -dsco spatialite=yes gdal_translate -of rasterlite byte.tif RASTERLITE:poly.sqlite,TABLE=byte and then both ogrinfo and gdalinfo show the vector and raster layers. Even -- Geospatial professional services http://even.rouault.free.fr/services.html ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] GDAL C# bindings - using rasterlite and spatialite in the same database
Hi *, I use the following command: rasterliteDriver.CreateCopy(RASTERLITE:GeoDatabase.db,TABLE=raster_test, source, 1, options, null, null); to read every gdal raster in my rasterlite database. After reading I'm also able to read another raster of vector file into the sqlite database. Everything works fine. My Problem is now if I do this the other way around: Then I first read a vector file into a spatialite database, and after that I want to read a raster file into the same database I get the following exception: does not exist in the file system, and is not recognised as a supported dataset name Does anybody know what I'm doing wrong? Best regards, Marcel ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] GDAL C# bindings using rasterlite
Hi *, currently I'm using SQLite + Spatialite + GDAL to manage vector data. I know it is also possible to use SQLite also with raster data. Therefore I have to translate all GDAL input data to sqlite as rasterlite. Does anybody know how to do that, with the help of the GDAL C# bindings? - Have a nice day, Marcel ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C# bindings using rasterlite
Le lundi 24 février 2014 09:35:42, Marcel Gangwisch a écrit : Hi *, currently I'm using SQLite + Spatialite + GDAL to manage vector data. I know it is also possible to use SQLite also with raster data. Therefore I have to translate all GDAL input data to sqlite as rasterlite. Does anybody know how to do that, with the help of the GDAL C# bindings? you should be able to do that with the CreateCopy() method of the Rasterlite driver. - Have a nice day, Marcel ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Geospatial professional services http://even.rouault.free.fr/services.html ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] Gdal C# Async Read
Is there any solution for reading a file with multi-thread access? Also every thread will read a different area. -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Gdal-C-Async-Read-tp5021363.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] gdal + C#
Hi Chaitanya All, In my GDAL1.9 version, I have a swig folder. And according to the below link http://trac.osgeo.org/gdal/wiki/GdalOgrCsharpCompile#Compilingthecode It says, that i need to download swigwin-1.3.31 package. My question is do i need to overwrite the existing swig folder with this downloaded swigwin-1.3.31. Awaiting reply. With Regards, Neelima Emmani ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] gdal + C#
Hi All, Actually i want to access gespatial data using GDAL into C#. For this I tried to add gdal reference to C#. I took gdal1.9 download from gdal website. Inwhich i found gdai19.dll . And then tried to add this as a reference to c# . But unfortunately, C# is popping me up with an error msg. Does anyone know how to read geospatial data into c#. Awaiting reply. With Regards, Neelima Emmani GIS Developer ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdal + C#
Neelima, Please go through the documentation in the website. http://trac.osgeo.org/gdal/wiki/GdalOgrInCsharp On Thu, Sep 6, 2012 at 10:31 AM, Neelima Emmani neelima.emm...@iictechnologies.com wrote: Hi All, Actually i want to access gespatial data using GDAL into C#. For this I tried to add gdal reference to C#. I took gdal1.9 download from gdal website. Inwhich i found gdai19.dll . And then tried to add this as a reference to c# . But unfortunately, C# is popping me up with an error msg. Does anyone know how to read geospatial data into c#. Awaiting reply. With Regards, Neelima Emmani GIS Developer ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdal + C#
Neelima, GDAL's C# interface binaries are not maintained well. So it is better to compile to get the latest version. If you are going to use the dlls available elsewhere, make sure you have them all. http://trac.osgeo.org/gdal/wiki/GdalOgrCsharpCompile#Compilingthecode shows a list of those files. On Thu, Sep 6, 2012 at 10:56 AM, Neelima Emmani neelima.emm...@iictechnologies.com wrote: Hi Chaitanya, Yeah, i went through the document and tried to compile gdal . And gives me a nmake fatal error:1077 that it is not able to find swig.exe.Yes, in my folder of swig which is under gdal doesnot consist of swig.exe, so, do i need to download it from external source. If so, even tried the same. But no result. My questions - - Do i need to really compile the gdal-1.9.1 - Can i use few dll's that are available on net like gdal_csharp, ogr_csharp, osr_csharp. But unfortunately, this option also did not work for me. Here, the C# accepted dlls. But popping up an error, when i ask it to ogr.registerall() or when i use any other gdal inbuilt functionalities. awaiting reply. With Regards, Neelima Emmani GIS Developer -- *From:* Chaitanya kumar CH [chaitanya...@gmail.com] *Sent:* Thursday, September 06, 2012 10:31 AM *To:* Neelima Emmani *Cc:* gdal-dev@lists.osgeo.org *Subject:* Re: [gdal-dev] gdal + C# Neelima, Please go through the documentation in the website. http://trac.osgeo.org/gdal/wiki/GdalOgrInCsharp On Thu, Sep 6, 2012 at 10:31 AM, Neelima Emmani neelima.emm...@iictechnologies.com wrote: Hi All, Actually i want to access gespatial data using GDAL into C#. For this I tried to add gdal reference to C#. I took gdal1.9 download from gdal website. Inwhich i found gdai19.dll . And then tried to add this as a reference to c# . But unfortunately, C# is popping me up with an error msg. Does anyone know how to read geospatial data into c#. Awaiting reply. With Regards, Neelima Emmani GIS Developer ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] GDAL/C++ Cut out and possibly reproject a sub-image
Hi folks, I am programming an application where I want to produce small tiles in a given projection from a lot of input image files. The input files may be different projections and resolutions. I have read the API tutorials and looked through the GDAL documentation, and searched this mailing list, but I'm still a bit uncertain as to how I should implement this. Hopefully someone can give me a few pointers to get started :-) I suppose I should use the Warp API to do the actual reprojection and cutting of the images. And I think I should use a VRT dataset to represent all the input images? If I understand correctly, a VRT dataset is a virtual dataset that represents several input files. I have however not figured out how to programatically add input files to my dataset? I was looking for something along the lines of an AddFile() method, but couldn't find any? Am I wrong in assuming that a VRT is the best way to represent my input data? Can I have a target GDALDataset that exists only in memory? I do not need to store the output image on disk , and it will always be quite small (typically 256x256 pixels), so I can not see any reason that it needs to be stored for of out of memory operations either. Also, I can't exactly see how I should set up the WarpOperation to reproject and cut only a sub-image of the large VRT dataset? Any help on this would be greatly appreciated! Cheers, Thomas -- View this message in context: http://osgeo-org.1560.n6.nabble.com/GDAL-C-Cut-out-and-possibly-reproject-a-sub-image-tp4883738p4883738.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL C# interface
Hi, You could try one of the packages available from here for example: http://vbkto.dyndns.org/sdk/ Best regards, Tamas 2009/11/13 yanb...@cma.gov.cn: Dear All, Who have GDAL binary DLL libs for C#? I download the source code and did not successes to compile them for C# interface. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: 答复: [gdal-dev] GDAL C# interface
Probaly FWTools or osgeo4w would support hdf4 packages. Best regards, Tamas 2009/11/13 yanb...@cma.gov.cn: Dear Tamas， Thanks for your reply and I checked the URLS in your email. Yes there are some binary packages supporting C#. But I checked the supporting raster formats, I found the one I will to use, HDF4 format is not included. Is there any ideas or good suggestions? Thanks a lot Yanbo -邮件原件- 发件人: Tamas Szekeres [mailto:szeker...@gmail.com] 发送时间: 2009年11月13日 23:11 收件人: yanb...@cma.gov.cn 抄送: gdal-dev@lists.osgeo.org 主题: Re: [gdal-dev] GDAL C# interface Hi, You could try one of the packages available from here for example: http://vbkto.dyndns.org/sdk/ Best regards, Tamas 2009/11/13 yanb...@cma.gov.cn: Dear All, Who have GDAL binary DLL libs for C#? I download the source code and did not successes to compile them for C# interface. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
