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

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169 views

Installing GDAL2.1

Here will be my sequence of command lines while trying to install gdal2.1 in a UBUNTU virtual machine. My virtual machine is a UBUNTU 16.04 LTS(64bit) I would need gdal2.1 and especially the Python ...
2
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1answer
56 views

Change which default python install runs .py scripts a the command prompt

I have 3 installations of python on my machine currently, the ArcGIS install, the QGIS install, and an Anaconda install. The Anaconda is the on that I use predominantly. If I run a .py script (...
3
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3answers
65 views

How to add all “.dat” files (raster) into QGIS, in a defined directory and defined legend (style), using python code

I'm using a QGIS 2.8.3 in Windows 10. I've added just one raster ("dat" file) to the QGIS, with a defined legend, using the following code. If I wanted to add all the "dat" files into a directory how ...
5
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1answer
75 views

How to save qml style including function in QGIS?

I made a style which needs function to work. In my particular case it is calculating azimuth between nodes of rectangles to display "direction". The problem is, if I save the style, the function ...
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0answers
76 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 ...
2
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1answer
83 views

Plot shapefile on top of raster using plot and imshow from matplotlib

I need to plot a shapefile on top of a raster. I would like to use the python package rasterio and some combination of fiona or geopandas to load the shapefile. I found an example in the rasterio ...
2
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0answers
36 views

Rasterizing Shapefile, using other shapefile as Mask

I have a shapefile (ShapeY) of European extend and want to rasterize each time only a certain area of the shape (ShapeX) (i have the shapes indicating the prevailing extend) with python and QGis. ...
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2answers
118 views

How to populate QTableWidget via plugin?

I am attempting to populate a QTableWidget by adding rows, this is done by the user clicking on the add button: I have the following code to try and insert rows but nothing is happening: def ...
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0answers
38 views

Unable to set background image of Qframe using python [closed]

Unable to set background image of Qframe using python following code works fine in centos but in window 7 not even its did not show any error self.frame_2.setStyleSheet(_fromUtf8("border:0px;...
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1answer
159 views

QGIS python script loop for raster calculator

How can I write a QGIS script for making a loop of raster calculator through a set of rasters? I know I can read multiple raster by applying: lddLrs = qgis.utils.iface.legendInterface().layers() for ...
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1answer
80 views

Python to Postgres insert Geometry syntax

Having trouble creating geom columns and inserting geometry lat lng values into postgres table Is my syntax correct in creating the point geometry fields? st_makepoint is the point constructor. ...
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1answer
55 views

How to do a Spatial Join after opening a GDB file with Fiona?

After I successfully open up an ESRI GDB file/folder with Fiona, what open-source Python package should I use to do a spatial join? I was told Shapely is not the appropriate package for this. I am ...
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1answer
56 views

tiff to shapefile using GDAL - slow speed

I am converting a 500MB .tif file to .shp file using GDAL. I am using the following: gdal_polygonize.py .tiff file -f “ESRI Shapefile” out.shp However, I abandoned the first attempt as in 12hrs it ...
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0answers
37 views

GDAL gdal_polygonize.py TypeError

I am using GDAL to convert a .tif to .shp file. gdal_polygonize.py input.tif -f “ESRI Shapefile” out.shp However this does not work and results in: Traceback (most recent call last): File "/usr/...
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0answers
50 views

Is there any way to connect features (entities) of dxf to database in python?

I'm using gdal, ezdxf, sqlite python packages and sqlite ODBC driver. They work fine, and in AutoCAD I can easily manually connect to my dbase.sqlite (read only) using _DBCONFIGURE and _DBCONNECT ...
4
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2answers
188 views

How to add support for FileGDB (Esri file gdb API) driver in fiona?

There has been a tons of questions on that but none of them solved my problem. I have a machine with: Windows 7 x64 Python 3.4.3 x64 gdal installed: gdalinfo --version --> GDAL 1.11.4, released ...
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0answers
98 views

GDAL RasterIO performance in C++ vs ReadAsArray in python/numpy

I'm currently writing optimisations for a raster viewer program which uses gdal as it's base. It's currently written purely in python, and has some major speed issues which cause problems when we are ...
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0answers
29 views

Nominatim address locator does't give longitude

I'm trying to geocode my addresses based on this tutorial: http://www.digital-geography.com/geocoding-addresses-in-arcgis-the-other-approach/#.VzMq_IR97Rb But Whenever I use Nominatim geocoder it ...
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0answers
44 views

Drawing contour with python QGIS?

I have one point layer and one contour layer and I was trying to draw a line around one contour, making a circle but not a uniform one, it has to have an irregular shape. I cannot find a tool that ...
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0answers
39 views

point in polygon starting with csv and shp in python

I have a csv file with two sets of lat/lon points - the first set of points is represented by columns V1(lon) and V2(lat), and the second set of points by V3(lon) and V4(lat) (the csv does not have ...
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0answers
36 views

Non-zero error with ImportFromEPSG() in GDAL/OSR/Python

I'm currently getting an error when testing ImportFromEPSG() on my GDAL. import osr testSR = osr.SpatialReference() testSR.ImportFromEPSG(4326) #this returns value of 6 print testSR.ExportToPrettyWkt(...
3
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1answer
57 views

How to get connection info from an .ags connection file?

I am working on a Python script to manage ArcGIS Server services (publish new services, update existing services, delete old services, etc.) in batch across multiple environments (e.g. dev, test and ...
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1answer
38 views

Fiona does not specify CRS

I try to write a geoJSON from a shp with the fiona package. Works, but fiona does not include the CRS information. with fiona.open(path) as shp: takeCRS = shp.crs takeSCHEMA = shp.schema ...
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2answers
61 views

Latitude/Longitude to city and zip, batch convertion

I have ~10 mln lat/lon points, and I need to extract city and zip code from them. I can do this with OpenStreetMap using the Nominatim API (using something like http://nominatim.openstreetmap.org/...
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0answers
65 views

Render Vector & Save as Raster

I am working with ENC files from noaa, specifically S57 format or ".000" to be as specific as possible. I am trying to render a layer or even the entire thing in a window but have had no luck. ...
2
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1answer
55 views

How do I use geometry object in processing.runalg()

I am trying to clip a polygon (large road network) with every row in another polygon (district polygon) using PYQGIS. layer_adm_level = QgsVectorLayer(base_path + adm_level + ".shp",'adm_level','ogr'...
2
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1answer
277 views

Generalization algorithms [closed]

Does anyone have the proper codes for line simplification and smoothing algorithms which is good to implement instead of ArcGIS algorithms? For example any of these: Visvalingam–Whyatt Reumann–...
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0answers
47 views

PyQGIS + Django Web Server — Not Working the Second Time Code Is Run

We are trying to create a standalone application on our local Django web server that uses PyQGIS to generate a series of maps based on a user's input. The user enters parameters on a web form and and ...
2
votes
1answer
53 views

Python module pyGTiff aligning data

I have been working with pyGTiff for a while and it works great. However my gis data does not have the same projection and extent. I saw that in the repository a a jupyter notebook with a test ...
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0answers
67 views

Using Python-Flask-MongoDB with Geolocation field running on App Engine?

I'm trying to write an app which would act as a address caching API, so basically it needs to store addresses (geolocations) and later on I could query on a random address and radius and get all the ...
3
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0answers
72 views

How to generate static heat maps server side?

I've been searching a way to generate server side static maps using Python (or any other languages, doesn't matter) I can create the maps I want with Qgis (And they look really great) but I don't ...
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1answer
182 views

Check if point is within radius of another point with Shapely

I've successfully used Shapely with python to check if a point is within one of a set of polygons in a .shp file but now would like to check if a point is within a circle of radius x miles from ...
5
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0answers
100 views

Different results from GDAL raster attribute table command on mac and windows

I am trying to get the raster attribute table of the following file: Shift_cult_past_current_prediction_20160107_gr1DD.tif available here: https://www.dropbox.com/s/fmomfpro3j6dmz8/...
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0answers
30 views

Help with Python shapefile Union Program

First I am a Python noob... I have searched the database for this answer, found a few that might be the answer, just way over my head (I am signed up for a intro python class this month, to help ...
2
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1answer
85 views

How do I change the pixel values of raster data from QGIS python plugin

I have been trying my hand at a QGIS plugin. The plug in reads raster layer data into an array, pipes the data to a C++ program, does processing over there, and pipes my results back. After a couple ...
3
votes
1answer
60 views

How to create dataset in python with creation options like in ogr2ogr with -dsco options

In ogr2ogr there is dsco option (data source creation option). e.g. ogr2ogr -f DXF -dsco trailer=trailer_buildings.dxf -dsco header=header_buildings.dxf out.dxf test_buldings_shp.shp. It works well, ...
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0answers
39 views

How to incorporate QGIS custom widgets into plugin? [duplicate]

Developing a plugin with Qt Designer for QGIS 2.14.1-Essen on Windows 7 and having trouble inserting the QgsCollapsibleGroupBox widget. I receive the following error: ImportError: No module named ...
2
votes
1answer
48 views

PostGIS query to get a list of points

I have a PostGIS road network layer (all features are linestrings) which I am accessing in Python and would like to get the geometry for each feature as a list of points. Something like [(lat1,lon1),(...
2
votes
1answer
93 views

Python Geocoder w3w

I am trying to use w3w API with this python geocoder correctly. http://geocoder.readthedocs.io/index.html It works fine when I use it with google and bing maps import geocoder g=geocoder.google('...
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1answer
12 views

How do I correct the GeoTransform of a GRIB dataset if I scale/crop the data?

I have modified the GRIB2 data to be cropped and a different size. I'd like to create a new GRIB2 file which contains this modified dataset. How do I calculate the new GeoTransform and create it using ...
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0answers
24 views

Python module for counting ratios from SHP attributes

Using OGR, I am supposed to create a Python module that finds out which specific administrative region of a country has the highest density of roads. I have two input shapefiles: roads connected ...
4
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1answer
83 views

Errror using the Simplipy QGIS plugin: 'QgsRasterLayer' object has no attribute 'selectedFeatureCount'

I am adding a raster in QGIS 2.14.1 and get this new error: AttributeError: 'QgsRasterLayer' object has no attribute 'selectedFeatureCount' I am not programming, just using a QGIS menu. I am using ...
4
votes
2answers
107 views

Installing third party python libraries in ArcGIS location

I'm running ArcMap 10.2.2 for desktop and have Python 2.7 installed as part of the software package. I'm trying to get the pyexcel and xlutils libraries installed. I ran a script to find the path of ...
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0answers
33 views

Export multiple Layer Definition Files (qlr)

I have a postgresql database with approximately 400 tables. I need to generate Layer definition files (qlr) in QGIS for each individual table. Making this manually would take huge amount of time, so I ...
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0answers
43 views

How to add dynamic text in standalone PyQGIS to reflect iteration of layer names

I am working with a standalone PyQGIS script below (that was given as an answer to How to iterate over layers and export them as PNG images with PyQGIS in a standalone script). The script exports the "...
1
vote
3answers
70 views

Fiona error adding property to shapefile

I'm getting the following error when trying to add a property to a .shp file using fiona in python: Traceback (most recent call last): File "<ipython-input-38-5f04c3b56601>", line 17, in &...
1
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1answer
67 views

Python Script GetParameterAsText?

I am writing a python script to be added to a toolbox and I do not know how to call an existing tool to be a parameter. import geocoder ##geocoding library import csv import arcpy ##...
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1answer
45 views

Merge points from multiple features that share common attribute

I have several point feature classes that all share similar attribute structure. How might I extract the points from all 9 feature classes that share a specific attribute? Background: There are 9 ...
0
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1answer
161 views

owslib - geonetwork - Failed to establish a new connection: Connection refused

i am tring to search for a specific record in geonetwork with owslib, according to documentation in https://geopython.github.io/OWSLib/. but it fails : >>> geonetwork = 'http://geonetwork-...
4
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1answer
129 views

Bold and Italic layer labels with Python in QGIS

I'm trying to apply some labeling properties to a layer using Python. Everything went fine, except the way I tried to apply the Bold and Italic settings. Here is a part of the code: layer....