Tagged Questions

An image mosaicing, reprojection and warping utility

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3
votes
1answer
392 views

How to reproject a raster to Winkel Tripel projection?

I'm trying to project a raster map (in ASCII grid format) from longlat to the Winkel Tripel projection. But I'm running into errors, for instance gdalwarp won't accept the proj-string. $ gdalwarp ...
3
votes
1answer
521 views

How to convert a geotiff from WGS84 to 3857 with gdalwarp?

I'm trying to convert images with WGS84 projection to 3857 but warp is not giving me a output I would expect. This is my command: gdalwarp -s_srs "+proj=merc +datum=WGS84" -t_srs "EPSG:3857" ...
1
vote
1answer
321 views

Georeference Raster File with WorldFile into an aerial photo using GDAL [duplicate]

Possible Duplicate: How can I transform a georeferenced JPG to a georeferenced TIF? UPDATE:Corrected link I must note that I am new to GIS so pleas be understanding. PROBLEM: I have a ...
2
votes
1answer
377 views

Technique using GDAL to overlay / fit one PNG map to directly overlay on another?

I have one .PNG basemap with known North edge of Latitude = 52.48, a South edge of Latitude = 21.94, an east edge of Longitude = -61.87 and a west edge of Longitude = -129.37. And I have another PNG ...
1
vote
2answers
178 views

How to apply v.transform on a set of vector layers (GRASS 6.4)?

I have 64 vector layers, all of them must be warped using the v.transform module; the pointsfile is the same for all vectors. How can I apply the transformation recursively to all layers? I'm not ...
4
votes
0answers
236 views

How to stop gdalwarp creating world-spanning outputs near the dateline?

I'm using gdalwarp to manipulate SRTM tiles near the the dateline (i.e. 180°, aka the antimeridian). SRTM tiles have a very slight (1/2 pixel) overlap with the meridian. You can see this using ...
0
votes
0answers
27 views

Convert Lambert png images to Mercator projection [duplicate]

Possible Duplicate: How should I use GDAL to perform a transformation? Is there any way of converting the output .png images of a WRF system which are in Lambert projection to Mercator? I ...
0
votes
1answer
676 views

gdalwarp results in incorrect extent

I have a GeoTIFF that's 172800x86400 on the MODIS "250 meter" Sinusoidal grid (more like 231.7, but who's counting?). (You can find its metadata at the bottom of this post.) This bounty of resolution ...
3
votes
1answer
263 views

Projecting GCP points into translated file

I have file A.png and file B.png. I translate file A.png so i could translate it into B.png (creating multilayer file). Is there any easy way to get new GCP points coordinates so i could combine those ...
1
vote
0answers
79 views

gdalwarp with -srcwin

I am trying to cut a window (in pixels) from a geotiff file and output in a different size. gdal_translate allows that but gives no option to set resampling, while gdalwarp allows resampling while it ...
1
vote
1answer
134 views

Cannot get gdalwarp to work

I am having some trouble getting gdalwarp to work. I want to clip my input raster in.img to the boundary of a polygon stored in a shapefile polygon.shp and save it out as out.img. The data type of ...
2
votes
1answer
291 views

Crop collar from chart

I need advice on how to complete the following task: I have aeronautical charts covering parts of the US (example: http://aeronav.faa.gov/content/aeronav/sectional_files/Albuquerque_89.zip - Each ...
1
vote
1answer
133 views

Open street map overlay white background

I have been working through trying to get the NOAA ridge radar image to act as an overlay. Looking at other entries on the site I have worked with the image and have it projecting correctly but the ...
3
votes
1answer
345 views

Adding metadata to a geographic gridded data-set and projecting it

I asked a question before that nobody answered...but I kind of figured it out myself. But I still remain with some things that I just don't seem to get right. Can anybody please find the time to help ...
1
vote
1answer
427 views

Gdal tiling error for EPSG: 3857

i have lots of data which was coordinated with gdal some programatic way at below: gdal_translate -of GTiff -a_ullr %s %s %s %s -a_srs EPSG:3857 %s/%s %s/%s.tif then for tiling them all i am ...
5
votes
2answers
1k views

Converting Ordnance Survey raster maps to WGS84 webmap tiles

I would like to generate Google/Bing-like map tiles from Ordnance Survey's 1:25000 and 1:50000 raster maps, which are provided as 4000x4000 UK national grid tiles (GeoTIFF). A sample tile can be ...
6
votes
1answer
469 views

How do I make gdalwarp set target extents to -180 -90 180 90?

I'm using gdalwarp with the -te option and it doesn't appear to be working like I expected. I'm running a command like: gdalwarp -of GTiff -te -180 -90 180 90 -tr 0.1 0.1 -t_srs EPSG:4326 input.tif ...
3
votes
1answer
627 views

Why does gdalwarp return incorrect corner coordinates for my geotiff?

I have a png source image that's in Lambert Azimuthal Equal Area and I have the long/lat extent. So I ran gdal_translate to create tie points and convert to gtif. Then I ran gdalwarp to reproject to ...
1
vote
1answer
297 views

gdalwarp - strange result

I have an input jpg image (sat thumbnail) and I know a number of gcps for this image. I want to reproject the jpg to have a north up image. This is what I do: ./gdal_translate -of GTiff -a_srs ...
6
votes
1answer
989 views

gdalwarp, cutline and postgis

I can not figure out how I directly can read a polygon into gdawarp's -cutline argument. My current approach is: ogr2ogr -f "ESRI Shapefile" mydata.shp PG:"user=myuser dbname=gisdb" -sql "select * ...