Questions tagged [gdal]
GDAL (Geospatial Data Abstraction Library) is an open source translator library & set of command-line utilities for processing raster spatial data formats. As a library, it presents a single abstract data model to the calling application for all supported formats. It also comes with a variety of useful commandline utilities for data translation and processing.
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6 views
Geopackage raster layer name is blank in QGIS Layers panel
I added two rasters to QGIS: "site01.tif" and "site02.tif" then added them to a geopackage. When I drag the geopackage into QGIS, the geopackage layers display as expected but the layer names are ...
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10 views
Re-project GeoJSON from pixel-space to lat-long in Python
I have created a GeoJSON of linestrings in pixel space using Python. However, I now need to re-project the file to match the same projections and extent of the .tiff file I wish to layer the GeoJSON ...
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14 views
After installation of gdal (to enable PostGIS tools) on Windows, sf gives warnings about dependencies
To get a PostgreSQL/PostGIS setup working on my Windows 10 machine I had to manually install GDAL using these instructions:
https://sandbox.idre.ucla.edu/sandbox/tutorials/installing-gdal-for-windows
...
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1answer
22 views
Classify DEM pixels
I have a differential surface model dataset. That was made: DSM subtracted from DTM, so for example trees have negative height. It is a raster (TIFF) dataset, Type=Float32.
I want to create a shape ...
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12 views
Merge GRIB-2 files to a single GrIB-2
I have two neighboring GRIB-2 files. they cover several meteorological information layers like wind direction, wind speed, gusts speed, precipitation, etc. for a 3 days period.
their internal ...
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1answer
9 views
Trying to make a calculation with gdal_calc.py | GDAL
I have a tif image that I'm trying to run gdal_calc.py.
In the source file the values are between 1,118-9,704 and I want to divide all the values by 10,000 to get results between 0-1.
This is the ...
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0answers
15 views
Running ogr2ogr script batchfile from SQL fails due to temporary drive mapping
I am trying to run the SQL procedure
EXEC xp_CMDShell 'blahblah.bat'
which needs to run an ogr2ogr script to create a kml from sql. The batch file works if I run it alone but with SQL permissions it ...
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9 views
GDAL Raster: How to obtain the cell ( and also the position) where maximum occurs?
I can obtain the maximum/minimum value of a raster via the ComputeRasterMinMax code:
using (var ds = Gdal.Open(tiffFile, Access.GA_ReadOnly))
{
var nCol = ds.RasterXSize;
var nRow = ds....
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19 views
How to properly reorder the raster data from bottom up to top down?
When creating a raster I set the lower-left x/y values, and asc file has the following "header":
ncols 1731
nrows 1863
xllcorner 17548488.944545675069
yllcorner -8069349....
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35 views
Seeking software for Pixel value extraction from large rasters? [on hold]
I am using arcpy.GetCellValue_management to extract pixel values and it works fine for a small number of pixels. However, using it to extract 25000 points over 25 years of daily data is taking a very ...
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37 views
Converting NetCDF dataset array to GeoTiff using rasterio Python
I have read a NetCDF file using the netCDF4 library and then read one of its datasets ("Evapotranspiration") into a variable (variable contains array) using the following code. Subsequently now I am ...
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57 views
Can't see or load raster data in QGIS
First time install and use for QGIS, running windows 7
In QGIS browser or through project>open I can not see any raster files/data, only vector data is shown. I do see them in ArcMap.
When I try to ...
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1answer
21 views
MODIS HDF file without Coordinate System?
I am using the MOD04_L2 MODIS Aerosol Deep Blue product from the LAADS API. These files are in hdf4 format, but I am transforming them to hdf5. I did transform the files because I'm unable to compile ...
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1answer
65 views
Drawing graticule with GDAL/OGR
I'm trying to generate a graticule with user-defined range of latitude, longitude, and interval; however, my code only displays one line of latitude and one line of longitude when loading it in QGIS. ...
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44 views
OpenCV Remap image from rectified image coordinates
I have orthorectified a drone image using ground control points. This results in a (4096 x 2160) array of recified X coordinates and a (4096 x 2160) array of Y coordinates. I want to remap the ...
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1answer
31 views
GDAL retile to create near-uniform file sizes?
I have a 60Gb raster vegetation dataset. I need to be able to access single pixels relatively quickly. At the moment, I am retiling at a fixed size, and saving those, indexing them in Python, and ...
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12 views
Referencing image using GCP-file?
I'm trying to automate the actual geo-referencing in PyQgis/PyQt5.
I went manually over the built-in GDAL Georeferencer in QGIS and saved a GCP-file. Also, the actual commands used for the conversion ...
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1answer
25 views
Create mean raster stack from raster stack
I am trying to create a mean stack image(1 panchromatic layer) from a stacked tiff image(13 panchromatic layers). How do i go about doing this?
My code:
from osgeo import gdal
import numpy as np
#...
1
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1answer
64 views
Masking areas outside of polygon using GDAL?
I am trying to "mask" raster cells that are outside of a polygon layer, setting them to "NoData". Also, I need to use GDAL, rather than R which I normally use, because the raster is too large to fit ...
2
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1answer
48 views
How can I display an image on QGIS from a DJI drone using python?
I have a few images from a DJI drone and I can get all of the information from the image exifread. I am trying to get an image to be displayed in the correct location on a QGIS map. Is there an ...
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26 views
How to create GeoTIFF from PNG raster and and pgw world file with GDAL
I've used GDAL tools for several other operations on GeoTIFFs.
There is lots of information on how to splice geotiffs into pgw world files and images, but I havent found ANY documentation on how to ...
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1answer
39 views
Opening .vrt file with rasterio in Python?
I have 3 raster files (.tiff files) which are geographically 3 consecutive tiles of a particular area. I am trying to make a .vrt file of 2 out of these 3 files using the gdalbuildvrt python command. ...
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13 views
Making color text file using GDAL?
I have an 8-bit greyscale image that I want to convert to a "heat map" based on data values (0-255), using a color ramp. I'm aware that gdaldem works with color-relief, so I used the following steps ...
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21 views
Nearblack pixel makes all pixel value to 0
I am trying to remove the dark edges around a boundary of a Drone image. I tried to use nearblack tool of gdal. However, it turns the entire pixel value to 0. This could be because all the pixel ...
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29 views
Changing color of GeoTIFF using GDAL and Mapbox?
I have a geotiff that I am importing to a mapping software that I want in the color pink. It is currently a white image, and I would like a GDAL option to change the color.
I am using Mapbox, which ...
1
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1answer
27 views
Blurring raster data across tile boundaries?
I have a raster dataset that is made up of 280 tiles, 51Gb total. I need to smooth/blur the data, retaining the same resolution. I would like to blur across tile boundaries, where possible, so that ...
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1answer
38 views
Open .tiff, set projection, then re-save in Python with GDAL
I am trying to set the projections of a .tiff file from another file with GDAL in Python. I successfully set the projections, but how do I re-save the .tiff afterwards?
Here is my code:
ds = gdal....
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1answer
18 views
Error using GDAL to Export Raster to GeoTIFF
I am correcting and cropping GeoTIFF DEM data using GDAL 2.4.0 to obtain the image raster. After doing my manipulations, I have the raster I want (checked by plotting with plt.imshow()), but while ...
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1answer
39 views
Gdal_calc outputs image with no projection
I am trying to convert a pixel value above 0.02 to be nodata. However, the output file comes out with no projection. When I assign projection, QGIS loads it in the wrong place.
gdal_calc.py -A "000-...
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20 views
Missing WFS driver in gdal installation
How do I enable WFS driver in gdal?
I've installed gdal from the official osgeo source in Fedora 27 using make. But running ogrinfo --formats, the WFS support is missing.
It seems that the format is ...
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14 views
Using gdaltransform function parameter 'srcfile'?
I'm working with GDAL in the command line using the gdaltransform function. One of the parameters for gdaltransform appears to be "srcfile". I want to have the source file be a custom file instead of ...
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11 views
Installing GDAL for Python having PostgreSQL already installed
I usually install GDAL following this instructions. Part of the process is to set up the GDAL_DATA environment variable to the path of the gdal-data folder of the previosly installed GDAL. Turns out ...
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0answers
39 views
Saving osgeo.gdal.Dataset as GeoTIFF or JPEG with world files using GDAL from Python?
I am trying to take a plain JPEG with no spatial references, apply ground control points (GCPs) to it, and output a georeferenced GeoTIFF or JPEG with world files.
I found some code that seemed like ...
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1answer
77 views
Iterating through every raster cell and calculating distance to other cells using Python?
I have a binary raster (.tif) in ArcGIS that shows builtup areas (value=1) and non builtup areas (value=0) like this:
In order to make a proximity analysis, I need to iterate through the raster with ...
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0answers
18 views
Installing ArcGIS Desktop , QGIS and independent Python packages on same machine?
I would like to have on the same machine all my GIS software installations. Both ArcGIS Desktop and QGIS come with their own Python installations but I want another independent Python where I can play ...
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20 views
No GDAL installers for latest versions of Python?
I usually install GDAL for Python using the files in GIS Internals. Since when installing packages through pip I was made aware that Python 2.7.16 is being deprecated next year, I went ahead and ...
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22 views
DLL error in various GDAL installations
I have a couple virtual machines with Python (2.7.16 and 3.6.6 - 64 bit) with GDAL installed using GIS internals installers and using this process
However when running gdalinfo --version on the shell,...
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1answer
18 views
How to keep color changes / corrections of all GeoTIFF files during merge with gdal or in QGIS?
I am trying to merge two GeoTIFF files in QGIS or w/ gdal, but when I merge them I lose the color changes / corrections I made to the second GeoTIFF.
Is there any way to keep the color changes I made ...
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2answers
26 views
Commandline tool to change RGB value of GeoTIFF
I would like to change the rgb-value of raster-tiffs from 0,0,0 to 1,1,1.
Is there a commandline-tool that can change the rgb-values of GeoTIFF files?
At the moment I use irfanview to change the ...
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2answers
30 views
Using dictionary of file names and DD coordinates to create points in shapefile using shapely?
I'm working on a Python script that strips the GPS info from images and uses that info to create a shapefile from that info. Right now I have all the file names as keys to tuples of decimal degrees ...
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0answers
14 views
Reloading raster file using GDAL in C#?
I'm trying to build an application to read in and display raster files using GDAL and C#. The opening and reading is fine. But, if I delete the file and reopen the file again, I encounter this ...
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0answers
31 views
Convert shapefile to DXF using ogr2ogr?
I want to convert shapefile with/without EPSG Code to DXF format.
I've tried following commands
ogr2ogr -f DXF output.dxf -t_srs EPSG:2004 stations.shp
ogr2ogr -f DXF output.dxf stations.shp
But ...
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53 views
Issue with AppData folder while using Python elevation module
I've run into an issue while trying to use the elevation module developed by B-Open Solutions srl and Alessandro Amici. The module allows for pulling DEMs directly from a server. I've installed all ...
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1answer
33 views
Which architecture to adopt when working with tile layers and Cartesian coordinates?
I'm currently working on a webmapping application dedicated to warehouse management. Where data is based on indoor geolocation and Cartesian coordinates system.
More precisely, the map background is ...
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1answer
43 views
Joining a csv file to shp (ogr2ogr)
I've been trying to use a ogr2ogr -sql call to create a ESRI.shp file with the joined attributes - but it keeps on failing due to
"ERROR 1 SELECT from table inshape failed, no such table/feature"
...
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0answers
14 views
GDAL open failed-4
In SPHY mdel preprocessor (modules to process) i am facing a problem of GDAL Open Failed-4 (snap is attached).
What could be the reason for this problem and how to resolve this issue?
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0answers
10 views
Add PNG as a layer in Mapnik
I'm playing around with Mapnik and trying to add a PNG image over a map created from an XML file. This is my XML file:
<Map background-color="white" minimum-version="0.7.2" srs="+init=epsg:3395"&...
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2answers
47 views
Problem with PostGIS ogc_fdw: unknown SRS
I am trying to connect a WFS from within PostGIS using the ogr_fdw foreign data wrapper
[https://github.com/pramsey/pgsql-ogr-fdw].
With most servers this works great!
With one specific server I get ...
3
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1answer
56 views
How to use gdal warp with modified crop_to_cutline?
I know that this question might be confusing, so I'll try my best to explain it.
I have a shapefile that I will be using to clip my raster:
This is my shapefile (whole island of Palawan, Philippines)...
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0answers
22 views
Unable to download Sentinal file from S3 [duplicate]
I trying below command to download file
gdal_translate --config CPL_TMPDIR temp -projwin_srs "EPSG:4326" -projwin 75.576740 31.138820 75.578092 31.137444 /vsicurl/http://sentinel-s2-l1c.s3-website....
