The numpy tag has no wiki summary.
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0answers
43 views
Averaging satellite data with missing values (using Python)
I am using sea surface temperature, chlorophyll, and other data parameters as covariants in a model, and I would like to average them over a particular time period.
I am currently doing this using a ...
11
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0answers
193 views
How can I utilize NumPy arrays to optimize big data geoprocessing?
I'm interested in learning how to utilize NumPy arrays to optimize geoprocessing. Much of my work involves "big data", where geoprocessing often takes days to accomplish certain tasks. Needless to ...
9
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2answers
320 views
Gdal Dataset.ReadAsArray() crashes Python
I am using Python 2.6.5 (32bit) with Numpy 1.3 and Gdal 1.9.1 installed on Windows 7 64bit. I am trying to read an 800 MB Imagine (.img) raster dataset into a Numpy array to do some raster algebra, ...
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1answer
72 views
keeping the coordinate system of raster files in the resulting raster file after operation with numpy
I'm trying to read as array two raster files using ReadAsArray in GDAL/python, perform some map algebra operation on it using numpy and then write the resulting raster file in GTiff format using ...
5
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1answer
271 views
How to keep spatial reference using arcpy.RasterToNumPyArray?
I am using ArcGIS 10.1, and want to create a new raster based on two preexisting rasters. The RasterToNumPyArray has a good example which I want to adapt.
import arcpy
import numpy
myArray = ...
10
votes
3answers
820 views
Writing numpy array to raster file
I'm new to GIS, and I'm lost with something I feel ought to be relatively simple. I have some code that converts infrared images of Mars into thermal inertia maps, which are then stored as 2D numpy ...
2
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0answers
117 views
How do I use scipy.ndimage.gaussian_filter1d on an arbitrary axis?
I have a GDAL raster that looks like this:
And I would really like to blur this raster along an arbitrary transect.
I see that scipy.ndimage has a gaussian filter that allows me to blur the raster ...
6
votes
2answers
721 views
How to fully load a raster into a numpy array?
I have been trying to check my filters on DEM raster for pattern recognition and it is always resulting in missing last rows and columns(like..20).
I have tried with PIL library, image load. Then with ...
4
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1answer
205 views
raster algebra in python with rasters of different extents
I am trying to find out how to use GDAL & numpy modules to average a set of rasters....which are Sigma0 values from satellite passes at different times within a year.
Each raster has been ...
5
votes
2answers
227 views
Adding noise to a raster
I want to add some fine-grained noise to a raster in an automated python process (i.e. I do not want to use Photoshop or GIMP). I looked at PIL, but unless I'm mistaken, it doesn't seem to have any ...
1
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0answers
215 views
ValueError when reading a raster band as a numpy array
Here's the problem shown in Python shell:
In [32]: from osgeo import gdal
In [33]: geotiff = '/Users/calvin/work/luc/proj_public/media/GLO
...
1
vote
1answer
270 views
Calculating beta-diversity w raster data [renamed]
Using ArcGIS 10, it is not possible to generate a raster attribute table for 32-bit float values. Instead, I have tried the RasterToNumPyArray method, which crashes since the file input raster is so ...
3
votes
1answer
346 views
PostGIS + pgRouting: Adding dummy links to a road network and performing routing analysis
I'm a beginner when it comes to postgis and pgrouting development.
For a project I'm working on and a bit of the algorithm:
I have a polygon layer that represents zones
I have a line layer that ...
