Linked Questions

6
votes
3answers
14k views

Get individual pixel values on a raster image using gdal and python [duplicate]

I'm now stuck with writing a piece of code to look up individual pixel values on a raster image. This piece of code mainly executes two tasks: (1) converting world coordinates to raster coordinates (...
1
vote
0answers
160 views

Extract raster values to multipoint shapefile and write to new field using gdal/python [duplicate]

I have a raster with one band and I would like to query a set of overlying points (.shp) to determine how many points as well as which points points fall under a range of certain pixel values ...
9
votes
5answers
23k views

Retrieve pixel value with geographic coordinate as input with gdal

I have a list of X,Y coordinates in UTM called coords. I also have a .tif of a digital terrain model (DTM) also referenced in UTM. I would like to use the Python wrapper for gdal to return the pixel ...
14
votes
2answers
19k views

Extract raster values within shapefile with pygeoprocessing or gdal

I would like to know how to get all the raster values within a polygon using gdal or pygeoprocessing, without reading the entire grid as an array. pygeoprocessing and gdal can do zonal statistics but ...
14
votes
3answers
5k views

PostGIS raster value of a lat/lon point

I have a tiff raster in my PostGIS 2.0 database. I want to get the value of the raster at a specified lat/lon point. I have: postgresql-9.1 postgis-2.0-svn with raster support a raster imported ...
8
votes
4answers
3k views

Extracting Values to Points without ArcGIS Spatial Analyst?

I have a raster DEM & multiple points. I want to determine the DEM elevation at each point. Other than manually examining the DEM at each point, (very time consuming with lots of points) is ...
8
votes
2answers
4k views

Get a pixel value

How can i do this operation: I want to get a pixel value fro the satellite image (Landat, GeoTIFF, 7 bands) using qgis-python. What operators should i use? (for example in qgis's Python Console)
12
votes
3answers
4k views

Image processing using Python, GDAL and Scikit-Image

I am struggling with a processing and hopefully I will be able to solve here. I work with Remote Sensing applied to Forestry, especially working with LiDAR data. The idea is to use Scikit-image for ...
2
votes
2answers
5k views

Extraction of raster with shapefile python

I have a raster tiff file containing vegetation index & also a shapefile of fields. I want to extract the field wise values from that raster file using GDAL. How can I do this? I can read the ...
5
votes
2answers
5k views

Finding the pixel coordinates using GDAL/numpy

Is there a way to get the XY cordinates of a pixel based on the array index using numpy/gdal? I have a new set of extents for a raster and, based on these newer extents, want to determine the ...
2
votes
1answer
4k views

Extract raster values from point using GDAL

I want to extract raster value from point shapefile geometry. Raster size is 45924 x 61671 and shapefile has 11.000.000 points. I'm using extract function from Raster package in R but is not very fast....
0
votes
2answers
2k views

Extracting coordinates from multipoint geometries?

I found this guide to get pixel value of raster under point: Getting pixel value of GDAL raster under OGR point without NumPy? I've a problem here: for feat in lyr: geom = feat.GetGeometryRef() ...
1
vote
0answers
1k views

GDAL tool for converting raster to point shapefile based on locations of another shapefile?

There is a shapefile with point data of rainfall sampled at a regular grid, and there is a shapefile with point data of soil attributes sampled at a regular grid, but the latter with smaller pixel ...
0
votes
2answers
743 views

How to get mean values of adjacent cells at point location when extracting values to points?

I use this code extract raster values to points. from osgeo import gdal,ogr import struct src_filename = '/tmp/test.tif' shp_filename = '/tmp/test.shp' src_ds=gdal.Open(src_filename) gt=src_ds....
0
votes
1answer
699 views

How can I determine elevation levels for a region in Java?

I need to find out the elevation levels for a certain region (center is located at 132.159633, 43.350116). For this purpose I went to the Elevation finder and downloaded there the relevant part of ...

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