Questions tagged [python]

Python is an open source interpreted programming language used in many GIS programs.

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141 views

Mapinfo wor file not working when file paths are updated using python

We did a data move and so I scripted the updating of the wor, so the old file path is changed to the new file path. It looks like it works perfectly but when I open the wor file it doesn't. When I ...
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210 views

Connect two points with fixed longitudinal slope over DEM - QGIS

Is it possible to connect two points with fixed longitudinal slope over DEM terrain or connect points with maximum longitudinal slope? Make road line between two point, for example 7% or make it with ...
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1answer
189 views

Oracle Procedure Call From ArcToolbox Script - Error processing call -

Background: I have an Oracle package with procedures to randomize and reset passwords for our SDE/GIS schemas. These procedures work perfectly via SQL Plus command line commands. My package looks ...
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355 views

pgsql2shp result as shapefile

In addition to https://gis.stackexchange.com/questions/173746/pgsql2shp-command-join-error?noredirect=1#comment260108_173746, the next command line works fine in order to join a table to a shapefile ...
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62 views

Accessing Geoserver plugins through the REST API

I am writing Python scripts to automate the creation of Geoserver layers. For this the gsconfig module has been invaluable, but I often need to execute operations that are handled by plugins, most ...
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145 views

Number of polygons in shapefile too high

I downloaded administrative shapefiles from www.gadm.com/country (China). The Python (Basemap) code below tells me that there are 2365 polygons in it. However the .csv and .dbf files included with the ...
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2answers
565 views

ArcGIS 10.3 not finding Python

I just updated to ArcGIS 10.3, and lost the ability to use all of the tools that are dependent on python. I do have "C:Python27>ArcGIS10.3>python.exe". The Python27 folder also had the ArcGIS10.2 ...
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44 views

Converting csv files into shapefiles using python [duplicate]

I have a csv file which i want to convert in a shapefile. i have seen many questions being asked on this topic but the main problem is all the polygons were of the same size but in this csv file the ...
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69 views

Installing GDAL Python bindings on Windows [duplicate]

This has been addressed before (Installing GDAL with Python on windows?), but I wanted to bring the question up again, to see if anybody has come up with a better method in the last 5 years, and to ...
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150 views

Spatial segregation from a raster of racial distribution in the USA

I am trying to measure the degree of racial segregation at some geographic level (let's say the county level, for simplicity) in the USA. I have a shapefile with these geographic units. To do so, I'...
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345 views

ArcGIS calculate average value

I would like to get the average value of specific attributes. I have a table with columns like: ID, P1, E1, Age1, P2, E2, Age2, P3, E3, AverageAgeP, AverageAgeE Sometimes there is a value for P, ...
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1answer
861 views

Semi Automated Classification plugin (QGIS) error when trying to create ROI

When I try to create a new ROI through Semi-Automated Classification plugin (SCP) for QGIS, I keep getting a message saying: "It appears that SciPy is not correctly installed. Please, see this page ...
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1answer
256 views

ArcGIS 10.0 Python script not working with ArcGIS 10.2.1. Looping through SelectLayerByLocations

Last year I got assistance from StackExchange to write a Python script for ArcGIS 10.0 which loops through SelectLayerByLocation with buffer until it returns no new rows. Then it uses the selection ...
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1answer
451 views

Convert DOY to mm-dd format [closed]

I have a problem with my date format. how can I convert day of year values to mm-dd format? For instance if my doy have a value of 161 this will be converted to 06-10 (June 10 for instance). And this ...
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92 views

Looping over array of type float with interval of float (NDVI) using Python?

I am stuck with my Python Script. The case is, I have an array of floating numbers from 0 to 1 (NDVI values). I want to loop over my array with an interval/step of every 0.025. Every interval/step I ...
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116 views

install python packages for qgis? [duplicate]

I need the twisted framework (Python) for a qgis plugin on Windows 7. I installed it with the pip installer. When I want to start the plugin it doesn't find twisted. When I start a python interpreter ...
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31 views

Closest raster VALUE to a given x,y point [duplicate]

Is there a way in ArcGIS to find the closest VALUE in a raster to a given x,y point? There might only be NoData at a certain point, in which case I want to find the closest pixel value. I can't seem ...
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1k views

ST_MakePoint returns an error when using Python

I am trying to use ST_Point or ST_MakePoint to create points from a table of latitude and longitudes coordinates. However I am consistently getting an error even when trying the examples. For example ...
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82 views

Refreshing QGIS view [duplicate]

I've written a short python script for use in QGIS (currently using 2.8.1) to set the CRS for all loaded layers to OSGB 1936 / BNG. The script correctly sets the CRS but I have to manually scroll in/...
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2answers
140 views

Use Python in Field Calculator to increment up value

Please see screenshot for field calculator Python logic. I have no idea what I'm doing that's any different from this GISSE answer. The error I receive is ERROR 000989: Python Syntax Error (invalid ...
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1k views

standard way to write a netcdf4

What is the standard way to write a netcdf4? I'm using this guide http://netcdf4-python.googlecode.com/svn/trunk/docs/netCDF4-module.html but when I dump the output file with ncdump, I get the error: ...
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1answer
516 views

Select by location and copy to new shape and name based on attribute

I have a point features and polygon features. I need to: Select points that intersect the polygons Copy the points to a new shapefile Name this new point shapefile using an attribute of the polygon ...
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2k views

convert lat/lon into meters

I have a database of latitude, longitude and radius in the following form: 48180759,11518950,19.0 Both latitude and longitude are expressed in degrees but then multiplied by 1e6 (or 1000000). ...
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235 views

GeoTiff using GDAL

How can I project a tiff using the position of the four corners where the picture have to be placed ? The tiff file has no georeference or projection information I have got a grid with values of ...
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1answer
174 views

Multiple Subsetting [closed]

Input File, XY min,max file I have a XYZ .csv file for a large portion of an area. I have another txt file which contains Box numbers, Xmin, Ymin, Xmax, Ymax. I would like to export a CSV file for ...
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37 views

How to get rid of suffixes from several shapefiles in a folder [duplicate]

I have several shapefiles in a folder and each one is suffixed by “ _LINES” or “_AREAS” I would like to get rid of these suffixes California_Aqueduct_LINES.shp --> California_Aqueduct.shp ...
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528 views

Proxy.cgi for OpenLayers reading from GeoRSS but not from WFS

I'm having trouble with the standard proxy.cgi written in Python for OpenLayers. Here's my code: #!C:/Python27/python.exe -u """This is a blind proxy that we use to get around browser restrictions ...
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117 views

FWTools Python ImportError: DLL load failed:parameter is incorrect [duplicate]

Please, can anyone help me solve this issue? Please find the attached snapshot for your reference. I am working on a Windows 7 Professional, Service Pack 1, 32-bit laptop.
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2answers
345 views

Aggregating rasters with GDAL

I have a set of files that have been mosaiced into a global VRT in a particular projection and resolution. However, I have a need to report statistics on a (say) one degree grid, where the reported ...
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1answer
334 views

Expression to display Image in MapTips?

In ArcMap, is it possible to display an image by using a path in the attribute table to show an image in MapTips? Any Python or vbScript expression are welcome as long as it is MapTips which shows ...
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1answer
214 views

Editing KML breaks icons

Edit: Solved it. When I was creating my new zip/kmz my code was creating various folders within the zip/kmz. Changed: NewZip.write(addedfile) to: NewZip.write(addedfile, newfl) /Edit I have KMZs ...
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1answer
141 views

ValueError using MapProxy decorate image middleware with WMS

I am successfully using Mapproxys decorate image middleware to apply a watermark to WMTS tiles. I am using the following code: def annotate_img(image, service, layers, environ, query_extent, **kw): ...
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312 views

pyspatialite, cannot update geometry

I'm trying to update geometry column with pyspatialite but it returns error: spatialite.dbapi2.IntegrityError: mypoints.the_geom violates Geometry constraint [geom-type or SRID not allowed] My ...
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1answer
326 views

PyQGIS: How to send signal to call unsetMapTool()

I've created a map tool to add some functionality to adding point features in QGIS 2.0. I'd like to unset this map tool if editing has manually been terminated by user. I've attempted as shown below, ...
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323 views

PyQgis: How can I preserve order or index when adding features to a Vector Layer from a file?

As I read data from a text file and add points to a QgsVectorLayer (as well as related attributes), each new record gets 'stacked' on top of the previous one in the Attribute Table (and within the ...
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1answer
518 views

Blank Shapefile output?

When executing the following command string in the active browser, Qgis projects the triangle polygon and associated attribute table correctly. Upon reopening the shapefile in a new browser, the ...
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1answer
225 views

In arcgis10.2, can I access arcobjects using python? [duplicate]

I am using python in Arcgis 10.2, but it seems Python cannot meet all my developing demands, from the forum, others recommend to use python to access arc objects,but what they mentioned is the old ...
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1answer
216 views

no viewable feature when creating line with ogr in python

the python code below produces the expected line shapefile viewable in QGIS import os from osgeo import ogr drv=ogr.GetDriverByName('ESRI Shapefile') if os.path.exists('test.shp'): os.remove('...
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74 views

Is it possible to compile a grass addon into a commandline app?

As the title says, I'm wondering if it's possible to take the source of a grass add-on and compile it into a commandline app. Or, alternatively, use the add-on in a python program. Basically, I don'...
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435 views

Creating layer with geom type wkbGeometryCollection with gdal python?

I am having trouble creating a layer with geom type as geometry collection. Thus I am unable to output to a shapefile. I have attached code below. dstLayer is null. This does not happen if geom type ...
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0answers
131 views

Error 14: Could not open CRS database

I am using Python Console and loading a Vector Layer using python commands. When the layer is added, QGIS first asks for the CRS to use, but I don't have all the CRS listed out to select the Reference ...
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0answers
689 views

MODIS images set CRS and reproject

I am developing a plugin which reads MODIS images, and I know that MODIS images are in sinusoidal projection and I need to set that CRS and project the image to WGS84 (epsg 4326) in python. I search ...
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0answers
938 views

Mapnik: GeoTIFF flipped (mirrored vertically)

I generated a GeoTiff using the QGIS HeatMap plugin and want to render it on top of some OSM data. The problem is that the raster gets rendered upside-down in the output. Can someone point me in the ...
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0answers
308 views

Using iface.showAttributeTable() on QgsVectorLayer retrieved by getObject()

I'm unsure if i'm properly using the processing.getObject() function. I'm creating a python processing script for QGIS 2.0 and 2.2, but can't seem to get an attribute table to open programmatically. ...
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27 views

slope in model different value than slope in stand alone script [duplicate]

When running slope(analysis) from model I receive a high value of somewhere around 71. After then exporting model as python snippet and changing only the output raster name (using same input raster) I ...
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1answer
1k views

How to generate jVectorMap for United Kingdom (UK)?

I have shapefile for UK , i need to convert this to the jVectorMap Here is my script python ^ converter.py ^ ./shapefile/map.shp ^ ./output/jquery-uk.js ^ --width 400 ^ --where "ISO = '...
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0answers
164 views

Delayed moving average

I want to develop a plot of delayed moving average. The code for this in MATLAB is: nr_pontos = 36; coefs_filtro = ones(1, nr_pontos)/nr_pontos; data_dma = filter(coefs_filtro, 1, data); figure,plot(...
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304 views

Convert raster_stats list output to array / csv file

I usually program in R, but recently I have started to use python for most of my spatial programming. My python skills are still limited, and please excuse the simplicity of the question. I am ...
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0answers
220 views

GEOS assertion failed

The following script fails, if I import the 'rasterstats' library. import rasterstats import ogr geom1 = ogr.CreateGeometryFromWkt('POLYGON ((415924.806155724043492 4489457.402624096721411,416359....
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1answer
701 views

Installing Lecos plugin for QGis 2.0.1 on linux fedora 20

I try to install Lecos plugin, which requires python imaging library (pil), but the installation fails with the following: "you need to have the image library pil installed" I installed the python-...