[GRASS-user] Flood simulation
Good day all, I want to simulate a simple flood situation. My steps are 1. Download the elevation data 2. Use r.lake to generate the raster image of the flood area No problem with this, works like a charm. Now I would like to get the "vector" variant of the flood area so I can run intersects with my other vector data to see what is flooded and whats not. Any tips with what tool or combination of commands I can achieve this ? -- http://iap.md, The future is open ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] PostgreSQL append
Good day all, 1. I have a vector grass file and I want to append it's data to a PostgreSQL table, atm I use the following command: v.out.ogr input=flood_vect type=area 'dsn=PG:host=localhost dbname=gisdb user=gis password=*' olayer=flood layer=1 format=PostgreSQL lco='OVERWRITE=YES' This command overwrites the postgis table, I want to append the data. If I remove the lco='OVERWRITE=YES' I just get and error that the table already exists. 2. When I export vector data to a PostgreSQL table it sets the wrong SRID > g.region -p projection: 3 (Latitude-Longitude) zone: 0 datum: wgs84 ellipsoid: wgs84 north: 47:04:48.37738N south: 46:55:11.265564N west: 28:44:44.481812E east: 28:58:20.944519E nsres: 0:00:02.885559 ewres: 0:00:02.885027 rows: 200 cols: 283 cells: 56600 the SRID of the geometry is 900917, I expect it to be 4326 (wgs84) what am I doing wrong ? -- http://iap.md, The future is open ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] PostgreSQL append
I am very new to grass so I am not sure if it's a bug or not, maybe I defined my "location" incorrectly, how do I check ? select * from geometry_columns where f_table_name = 'flood' f_table_catalog f_table_schema f_table_namef_geometry_column coord_dimension sridtype public flood wkb_geometry2 900917 POLYGON On Sun, Aug 2, 2009 at 11:25 PM, Markus Neteler wrote: > On Sun, Aug 2, 2009 at 9:43 PM, Pavel Iacovlev > wrote: >> Good day all, >> >> 1. >> I have a vector grass file and I want to append it's data to a >> PostgreSQL table, atm I use the following command: >> >> v.out.ogr input=flood_vect type=area 'dsn=PG:host=localhost >> dbname=gisdb user=gis password=*' olayer=flood layer=1 >> format=PostgreSQL lco='OVERWRITE=YES' >> >> This command overwrites the postgis table, I want to append the data. >> If I remove the lco='OVERWRITE=YES' I just get and error that the >> table already exists. > > The OGR tools support is: > ogr2ogr -update -append .. > > but I am afraid that v.out.ogr does currently not. > > >> 2. When I export vector data to a PostgreSQL table it sets the wrong SRID >>> g.region -p >> projection: 3 (Latitude-Longitude) >> zone: 0 >> datum: wgs84 >> ellipsoid: wgs84 >> north: 47:04:48.37738N >> south: 46:55:11.265564N >> west: 28:44:44.481812E >> east: 28:58:20.944519E >> nsres: 0:00:02.885559 >> ewres: 0:00:02.885027 >> rows: 200 >> cols: 283 >> cells: 56600 >> >> the SRID of the geometry is 900917, > > Do you mean 900913 (the unofficial outdated Google Mercator EPSG code) > ? > >> I expect it to be 4326 (wgs84) what am I doing wrong ? > > It should be like that. I currently have no PostGIS installed for > a test. Maybe someone else in this list... > > Markus > -- http://iap.md, The future is open ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] PostgreSQL append
> g.proj -w GEOGCS["wgs84", DATUM["WGS_1984", SPHEROID["wgs84",6378137,298.257223563], TOWGS84[0.000,0.000,0.000]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433]] shape .prj file: GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["wgs84",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]] On Mon, Aug 3, 2009 at 12:46 AM, Markus Neteler wrote: > On Sun, Aug 2, 2009 at 11:35 PM, Pavel Iacovlev > wrote: >> I am very new to grass so I am not sure if it's a bug or not, maybe I >> defined my "location" incorrectly, how do I check ? >> >> select * from geometry_columns where f_table_name = 'flood' >> >> f_table_catalog f_table_schema f_table_name f_geometry_column >> coord_dimension srid type >> public flood wkb_geometry 2 900917 POLYGON > > Two ideas: > > - run to obtain the projection of the location as WKT output: > g.proj -w > > - export to SHAPE file first and see if the .prj file is ok (LatLong in > your case). > > If both is fine, then would I suspect some problem with the PostGIS > export. > > Markus > -- http://iap.md, The future is open ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Interactive flood simulation
Good day, I wrote a simple web flood simulation application. Posting here the source code, maybe it will be useful for someone who wants to use GRASS from PHP. Example: http://flood.iap.md/ Source code: http://code.google.com/p/grass-flood/source/browse/#svn/trunk PHP Class for connecting to grass application: http://code.google.com/p/grass-flood/source/browse/trunk/Grass.php The example features GRASS, PHPMapscript, OpenLayers, PHP and how they can work together, based on http://grass.osgeo.org/wiki/GRASS_and_PHP -- http://iap.md, The future is open ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Interactive flood simulation
Thanks everyone for replies. Markus Neteler, Will post a screen-shot and a small description today. On Tue, Aug 11, 2009 at 8:38 PM, Markus Neteler wrote: > On Tue, Aug 4, 2009 at 2:21 PM, Pavel Iacovlev > wrote: >> Good day, >> >> I wrote a simple web flood simulation application. Posting here the >> source code, maybe it will be useful for someone who wants to use >> GRASS from PHP. >> >> Example: http://flood.iap.md/ >> Source code: http://code.google.com/p/grass-flood/source/browse/#svn/trunk >> PHP Class for connecting to grass application: >> http://code.google.com/p/grass-flood/source/browse/trunk/Grass.php >> >> The example features GRASS, PHPMapscript, OpenLayers, PHP and how they >> can work together, based on http://grass.osgeo.org/wiki/GRASS_and_PHP > > Very nice! Please submit a screenshot plus short explanation to > http://gallery.osgeo.org/ > > Markus > -- http://iap.md, The future is open ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
