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

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ignore Null Values when iterating through fields with python

So far I have a code which iterates through Fefature Classes and ignores all fields of type String, Geometry and OID. I now try to add some lines which tell python to ignore all NULL values when ...
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2answers
43 views

Applying symbology to a layer with python, How to only have symbology in TOC that the sub layer has

i am trying to apply a symbology to multiply layers that i have created from one feature class. The original feature class is used to create several sub layers see layer loop this involves using ...
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1answer
45 views

add text value to attributes

this is a novice question I have an attribute field that's missing a piece of information, i'd like to amend the attribute field like below: This is the current attribute field: "V:\Building & ...
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1answer
32 views

Landsat Surface Reflectancce product Python packages

I have to work with numerous Landsat surface reflectance product that I downloaded from http://landsat.usgs.gov/CDR_LSR.php. The product comes with a QA data with information on clouds and shadows ...
2
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1answer
167 views

How to add an interpolation raster from the python console in QGIS?

I'm trying to add an interpolation layer based on an existing vector layer by using the Python Console (initially in the menu Raster/Interpolation), but can't find anything related in the ...
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0answers
46 views

QGIS python originalName() does not return actual original layer name

I am writing a Python QGIS Plugin, using QGIS version 2.6 as the basis for development. When loading data into the canvas programmatically, I am trying to maintain the spatialite table name as the ...
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0answers
40 views

If then statement in model builder

I have a model that adds several fields, two which are manual inputs (County Name and User). I am manipulating several parcel layers (approx 90 counties). In my model, one field takes the state and ...
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1answer
2k views

Count of raster cells as variable in ArcGIS ModelBuilder?

I want to use a cell count of an integer raster as a variable in Arcgis 10 ModelBuilder (and later in a python script), but can't seem to find how to access this information. Is there a (python) ...
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2answers
70 views

Creating a really large shapefile without eating all the virtual memory

I am doing something similar to below to create a really large (large than memory on my machine) shapefile: shapes = shapefile.Writer(shapefile.POINT) shapes.autoBalance = 1 shapes.field('MyId','N') ...
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0answers
31 views

import qgis geoprocessing tools in python os x 10.9.5

I'd like to use the python bindings from qgis, but in a standalone project. I need the geoprocessing tools for vectors. I updated QGIS (Wien - 2.8), python (3.4.3), etc. However, it always ends with ...
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1answer
50 views

What resampling method is used in gdal_merge?

I am using the gdal_merge python script to merge rasters that have slightly different, though similar, input resolutions. The documentation advertises that it can handle different resolutions, and in ...
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2answers
268 views

QGIS Python Script - Routing along Waypoints [closed]

I used Anita Graser's script point_layer_to_route.py which worked like a charm until I updated to 2.6. With QGIS 2.6 I always get objects without any features. Can anybody tell me if he/she had the ...
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1answer
60 views

arcpy.da UpdateCursor where_clause

I am trying to get a where_clause working on a UpdateCursor (arcpy.da). I can get it to work fine with a SearchCursor, but for some reason the same clause throws a RuntimeError: General function ...
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2answers
38 views

working with geojson and vincent on python

I want to import a geojson file into python so I can map it with a visualization package vincent and merge with other data in a pandas data frame. To be specific, the said geojson file is: ...
2
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1answer
146 views

How to print 2 maps in the same PDF page using PyQGIS?

I am trying to generate a one-page PDF document containing the following items: 1) On the left half, a full state map (say, New York State). 2) On the top right quadrant, a map that zooms in to one ...
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1answer
43 views

arcpy.da.Walk not adhering to datatype filter “Locator”

I have a file gdb containing feature classes and address locators. I am listing and storing the names of the datasets using arcpy.env.workspace = "C:\input.gdb" (root, fds, ftrs) = ...
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1answer
34 views

Labeling layers with Python in QGIS. LinePlacementFlags

How could I set LinePlacementFlags with Python in QGIS? My code is something like: palyr = QgsPalLayerSettings() palyr.readFromLayer(layer) palyr.enabled = True palyr.fieldName = "attribute" Then ...
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1answer
698 views

Linux Client for OpenGTS server

I've installed an OpenGTS server and successfully linked it with the GPS2OpenGTS_Pro application for android. The buses I'm tracking offer 3G with a wireless AP, however whenever the bus stops, the ...
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45 views

How to automatically generate pour points along stream network?

The following screenshot shows the results of a water flow analysis where I identified stream order via the Strahler method in ArcGIS. Now I need to generate watersheds for 2nd order streams and ...
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2answers
168 views

Call output files in temporary directory through Processing Toolbox (python)

I need to create temporary files as intermediate output to be used with processing algorithms. So, I implemented this: Processing.runalgorithm("grass:v.to.rast.attribute", ........, None) This line ...
2
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0answers
45 views

Using Python to iterate through directory to create event layer and perform kernel Density for each file?

I am new to Python for ArcGIS, but have been using ArcGIS a while. I have a large directory of tables with point data. For each file of each folder I want to create a kernel density layer. I have ...
4
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1answer
2k views

How to create polyline of varying distance from origin point using azimuth?

I am looking for a Python script that does the following: Uses a point (from a point shapefile) as the origin. Creates about 3 km line from point Based on an azimuth provided in the original point ...
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0answers
25 views

Execute GRASS command within qgis phython console

We try to calculate catchments with the r.water.outlet function from python console. To do so we use the following code: import processing rlayer = QgsRasterLayer("/my/path/DrainageDirection.tif", ...
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1answer
197 views

QGIS 2.6 - installing exifread for photo2shape plugin

I've already seen Error loading plugin photo2shape even after installing exifread module and Error installing Photo2Shape QGIS 2.6 for Mac, and other forums, but can´t make it work. First I installed ...
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2answers
123 views

Select Layer By Attribute to be used in for loop

I'm trying to iterate through a feature class and select each feature one by one by using the OBJECTID field. When I use a single value, the SelectLayerByAttribute works, but how do I compare the ...
2
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1answer
81 views

How to create a plugin GUI for QGIS 2.8.2?

I create a pluging with the pluging builder in Qgis 2.8.2. I went to the folder of my pluging : C:\OSGeo4W64\apps\qgis\python\plugins\yu in order to visualize al the files that the pluging builder ...
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1answer
52 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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11answers
29k views

Full list of ISO ALPHA-2 and ISO ALPHA-3 country codes

I'm searching for a full list of countries with their country codes. Like on this page (need full and valid): http://www.nationsonline.org/oneworld/country_code_list.htm Thanks.
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42 views

Advice for Python with GIS [duplicate]

How you can I install different packages in python and not have problem with the arcpy module in ArcGIS? I want to be able to run Python as standalone, do other python programming as well as GIS ...
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3answers
681 views

How to make Field Value constant size (length) by appending zeros towards end?

How do I append my field values in my .dbf to correspond with the values of my feature's attribute table. I need to append 0's to the field value if the field value is less than 11 characters in ...
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2answers
232 views

Issue while running grass from subprocess

I have a map based web application using geodjango. I needed to display the crime hotspots within a selected polygon area. I found that v.kernel is very good for generating heatmaps/hotspots. So in my ...
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1answer
82 views

Value Error with Float/Integer/double Fields in Python?

When running this Code: import arcpy from arcpy import env import os #Specify the map document and the data frame mxd = arcpy.mapping.MapDocument(r"G:\\PythonCode\\mxd_test.mxd") env.workspace = ...
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1answer
2k views

64 bit Python on ArcGIS 10.2.2 for Desktop

I am trying to have Python 64-bit with ArcGIS so that I can use my entire RAM when doing data analysis. Apparently ArcGIS 10.2 Desktop comes just with 'Python 32-bit'. Should I install a fresh Python ...
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0answers
50 views

Configuring Python to avoid conflict with ArcGIS for Desktop (ArcPy)?

I am trying to find the best way to configure a new version of python in my computer (windows) so that I do not have any problem with the python version that I have with ArcGIS. Is there anyway to ...
4
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4answers
761 views

How to get arcpy to work with Anaconda?

I am trying to follow the step-by-step directions in the answer to "how to separate Python installation with ArcGIS" but cannot find the path file, DTBGGP64.pth, in ...
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1answer
52 views

cannot concatenate str and list objects

I'm trying to rename a group of rasters to "I1986_" + [The 1st 3 letters of the raster]. For example, if a raster is named "Raster1", the output would be "I1986_Ras". I've tried including str() ...
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0answers
34 views

Spatial join with multiple intersecting features

I have a polygon dataset representing pavement areas broken up by year of construction and a roads centerline dataset that contains values for remaining service life (RSL). I want to spatially join ...
1
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1answer
38 views

Field calculater in Python console from QGIS

I have some doubts in syntax of processing.runalg(qgis:fieldcalculator) in python console of QGIS. I want to create a new field in a shapefile and calculate this formula: [D_PATRICIA]*1000. ...
4
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1answer
152 views

Why can't I copy values from a virtual field to a non-virtual field using PyQGIS?

Using the python console, I am trying to copy values from a virtual field into another non-virtual field. Both fields are integer types but I get NULL in the non-virtual field. I followed the answer ...
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1answer
111 views

Problem with Memory storage type in PyQGIS when updating with auto form

I have a layer of "Memory storage" type (Memory provider) which I created with Python. When editing=on and updating values using the attribute table interactively everything works as expected, i.e. ...
1
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1answer
31 views

How to search for fields in a GDB and add them if they don´t exist with arcpy?

I have a list of files that need to be present in my featureclasses - myFields[]. I need to add these fields if they are not present in my FeatureClasses. import arcpy myField="Field01" myFields = ...
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2answers
1k views

Using File Geodatabase with Null values in Field Calculator of ArcGIS Desktop 10.0?

I want to use the field calculator to get the sum of a couple of columns. The problem is that some of them has Null Values. I am not able to find a solution. I tried this Python functions: stack( ...
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1answer
38 views

How to replace field name with a variable in exported whereclause?

In the select by attribute how do I replace "AADT", with a predefined string variable? I don't understand the pattern in "\"AADT\">=" , can you please explain why is it that way when exported from ...
1
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1answer
94 views

Performing image segmentation in QGIS?

I have been trying to learn to work with QGIS (open-source GIS software) through some tutorials available online for classification of image for land cover. These tutorials used a dataset from Landsat ...
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1answer
51 views

Python Script to Select records based on user input

I am running Arc 10.3 in a versioned environment. I am attempting to write a simple code that will select service records coming from Oracle CRM to a separate feature class containing only records ...
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1answer
62 views

Polygon found with search cursor, but not update cursor

Here's my issue. I am doing two things with arcpy: 1) I search a feature class using arcpy.da.SearchCursor() and pull out a UID field and the geometry in WKB format for all polygons in the file, ...
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1answer
294 views

Error in Select Numeric type column in pyodbc with ArcCatalog

I created a python script that uses "pyodbc" plugin to connect a SQL Server database and write out data. It was imported in an ArcGIS 10.1 tool and run from there. try: arcpy.AddMessage('FLAG 0') ...
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0answers
41 views

Image formats to use for land cover classification in Python? [duplicate]

I am supposed to classify images for different land covers or land uses in Python. I read somewhere that the spectral module of Python is required to do the processing of Hyperspectral image data. ...
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0answers
19 views

Python Error when I start Qgis

Thank you for the comment for this post: QGIS 2.8 starts with an error and I am not able to run Python console I have run yum search yum search qtwebkit and I got it that is installed. ...
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1answer
24 views

Parsing path and calculate value in model builder

I am experiencing an issue with the model only tool calculate value. I am attempting to use the parse path and calculate value model only tools to force a feature dataset into the create topology ...