Tagged Questions

3
votes
1answer
114 views

Grid registration issue converting from GeoTIFF to ARC ASCII Grid

I've got a 3 arc second digital terrain model represented as a 32-bit GeoTIFF that looks like this: $ gdal_info gom03_v1_0.tif Driver: GTiff/GeoTIFF Files: gom03_v1_0.tif Size is 10200, 7800 ...
2
votes
1answer
123 views

How to create contour from NetCDF?

I have downloaded Bathymetry data from GEBCO. Its in NetCDF format. I want to create contour from it. I tried so many tools to convert the file into raster but couldn't do so. How can I create raster ...
3
votes
1answer
191 views

GeoTiff convert to PNG with transparency

I need to convert a GeoTIFF image to PNG format with "NoData" pixels in the original image being transparent in the output. Is there any tool particularly in ArcGIS ArcToolbox or GDAL for this ...
1
vote
1answer
145 views

Tools to flatten the jp2 to a single band (average the bands)?

I have created thousands of png tiles using arcgis and have merged groups of them into large jp2 files for serving via geoserver. I need to flatten these to a single band so that I can apply a colour ...
6
votes
1answer
578 views

Importing GDAL from ArcGIS python window - is it possible?

I am trying to run some Python code using the Python window in ArcGIS 10.1 that uses both the arcpy and gdal modules. However, when I try and import the gdal module I get an error: ImportError: No ...
4
votes
1answer
359 views

ArcGIS SP4 fails to open file geodatabases created with ogr2ogr

I've been using the new FileGDB support in gdal-1.9.0 to create file geodatabases that can be opened in ArcGIS. For example (I'm doing this all on one line, so I'm not certain this will run as ...
3
votes
0answers
169 views

Equipotential Surface Generation Using Monte Carlo Simulation on Large Raster Images

All, I have a large (1GB+) raster that I am using as the base for the generation of an equipotential surface. This is to assess the accuracy of DEMs derived from another source. In situ ...
7
votes
2answers
782 views

Poor image quality of raster pyramid files in ArcGIS (no anti-aliasing)

There are several GeoTIFF files (size ~7000x7000 px) which I try to open in ArcGIS Desktop 10.0. I have already created raster pyramids for them (.ovr files) using geoprocessing tool but their quality ...
3
votes
1answer
333 views

Is it possible to create color tables for floating point raster maps in GDAL?

I've got a script that dumps a floating point raster that I'd like to automatically color. Currently I load this raster in Arc or QGIS and manually create a color table every time I re-run my model. ...
13
votes
3answers
4k views

How do I change geotiff “no data” color to white/transparent rather than black?

I am preparing data for inclusion into a geonetwork node, where the maps are displayed via geoserver. The problem is that cells that have"no data" are displaying as black in the geotiff and I am would ...
8
votes
7answers
4k views

How to get raster image as array in Python with ArcGIS

When starting to work with Python and ArcGIS 9.3, I assumed there would be a simple way to get a raster image into a Python array so that I can manipulate it before storing it back as another raster ...