Alexandre,
Your straight forward method is the best.
PostGIS takes care of optimization using rectangular bounding boxes.
Union function works best if you use it as an aggregate function. In OGR,
you can use OGRGeometry::UnionCascaded() by passing a OGRGeometryCollection
object to it.
On Fri,
Rapid response for true color has this:
;- Rapid Response default enhancement: 0,0, 30,110, 60,160, 120,210,
190,240, 255,255
x = byte([0, 30, 60, 120, 190, 255])
y = byte([0, 110, 160, 210, 240, 255])
;- Rapid Response cloud enhancement: 0,0, 25,90, 55,140, 100,175, 255,255
if
Nikos,
You can use the VRT format [1] in GDAL to perform this. The ComplexSource
elements can have an LUT element. It can be used to specify your lookup
table. The values in between are interpolated linearly.
[1]: http://www.gdal.org/gdal_vrttut.html
On Fri, Jun 10, 2011 at 10:19 PM, Nikolaos
Similar to another ongoing thread, I am needing to convert imagery to 8 bit
to display in my own viewer.
This has presented me with a few issues. It seems like no matter what of the
GDALDataTypes I perform a sizeof() operation on, be it GDT_Byte or GDT_Float32,
the size is always 4 bytes.
After an afternoon of work - I am able to get the Actual Bits per pixel by
getting the metadata, and doing a bunch of string parsing. This is not really
that ideal either, so I am still open to suggestions if there is a cleaner way
of doing it via the API that I just havent stumbled upon.
I believe the way to do it is check the number of Raster Bands and then check
the Data type of each band. Three bands of GDT_Byte equal 24-bits, two are
16-bit etc etc. One Raster Band of GDT_Float is probably an elevation model
(DEM). The number of combinations is almost infinite this way
Hi,
I try to load some data to MapServer (and display them as WMS) from
WFS 1.1.0 server (also MapServer-based).
From various reasons, I defined the WFS layer as OGR layer type, with
connection set to WFS definition file:
LAYER
CONNECTION wfs.wfs
CONNECTIONTYPE OGR
DATA line
sorry, I hit the Send button accidentally
so, the request
http://localhost/cgi-bin/ows?SERVICE=WFSVERSION=1.1.0REQUEST=GetFeatureTYPENAME=lineFILTER=Filter
xmlns:gml=http://www.opengis.net/gml;BBOXPropertyNamemsGeometry/PropertyNamegml:Boxgml:coordinates48.7275012197312094,12.9295317871890720
Hello again,
I am reading over some of the documentation and information I can find on GDAL.
I have some pretty large NITF images that I want to break up for purposes of
displaying in a viewer I am developing. My current plan is to tile the images
into 1024x1024 blocks. The full images are
