Thank Antoine's replay.But since I am a novice both to OSG and GIS, some
professional concept like VRT is not familiar to me .So I will take some time
to learn these konwledge about the VRT SRS and GCP. Thank you!
在2007-04-08，"Antoine Hue" <[EMAIL PROTECTED]> 写道：
郑富强 wrote: > Hi. > When I try to attach a texture(JPG picture) to a DEM file
,using the > command as something like this: > >>osgdem -t texture.jpg -d
terrain.dem -l 8 -o out.ive > There existed a information below: > * > error:
Unable to compute a transformation between pixel/line and > georeferenced
coordinates for texture.jpg. There is no affine > transformation > and no
GCP's. > * > And of course ,the result I got is not what I expected,there's
just > the picture on a plane(missing the terrain information) > How to deal
with such situation? > What you get is a GDAL error. You should create a "World
File" or a VRT file for GDAL to tell the georeferencement of your image. World
file is quick but limited to homogeneous coordinate systems. VRT is more
complex but also more complete: - image own coordinate system (SRS) -
calibration points (GCP) ... Antoine
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