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

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3
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1answer
966 views

ArcObjects: How to get from IFeatureClass on annotation feature class to IAnnoClass?

I am working in Python 2.6 and ArcGIS 10.0 through comtypes, so I have full ArcObjects access. (See the answer I tacked onto the related question "How do I access arcobjects from python?") That ...
3
votes
1answer
274 views

ArcObjects ITextSymbol.GetTextSize in Python: How do I define two input variables that get populated by the method?

I am using Python 2.6 and ArcObjects in ArcGIS 10.0 to build and draw, among other things, graphic text on the current display. At one point I need to use the ITextSymbol.GetTextSize method. In a ...
23
votes
6answers
19k views

Defining projections for multiple shapefiles in ArcMap?

I have over 100 shape files that don't have .prj file and thus when I bring them into ArcMap 10 they show the coordinate system as unknown. I know all of the shape files coordinate system is GCS WGS ...
0
votes
3answers
15k views

Python Question - how do I extract a part of a string [closed]

I'm building a tool in python and for that I have a question: I have a string such as "Denver.dwg Group Layer\Denver.dwg Annotation". How do I assign to a variable (for later print) only the first ...
8
votes
4answers
2k views

Best way to find the polygons crossed by a line

I'm trying to find all the polygons crossed by a single line (a GPS track). I'm using the OGR library (from python) for computing this, but it's currently a bit 'brute-force' (and slow). For every ...
9
votes
5answers
6k views

update one shapefile attribute table with values from another dbf table

I try to explain here what I am trying to do: I have one shapefile and one independent dbf table with the same fields. In the dbf table all the fields are populated but in the shapefile attribute ...
9
votes
1answer
2k views

automated georeferencing

I am attempting to fully automate the process of georeferencing a load of .png files - i have xml file containing the co-ordinates - but how can i use them? Does anyone have any advice?
7
votes
2answers
1k views

selecting by attribute and specific value replace

I want to select all of the features by attribute where the attribue in myattrib is like... Selection "criteria H". That is not a problem. However then I need to replace (myattrib," H", "") except ...
8
votes
1answer
4k views

Problem with setValue() function in ArcGIS 10

I'm trying to add data to an attribute table in ArcGIS 10 using the following code: def make_floor_no( shapefile ): "Makes header for number of Floors (FLO) and calculates value" fieldName = ...
4
votes
2answers
334 views

Unique Character Generator Help

I am working on a script that will populate 3 letters into a field. I have to use letters due to field limitations and to make sure that I have enough combinations. I'm not really sure where I am ...
12
votes
4answers
2k views

Looking for a pythonic way to calculate the length of a WKT linestring

I was quite unsatisfied with Calculating Length of Linestrings in WGS84 in Miles. It kept me wondering if there is a more convenient, Pythonic way to calculate the length of a WKT linestring according ...
11
votes
5answers
2k views

how can i convert a shapefile to lat and lon boundaries?

i have a shapefile of country subdivisions and i would like to extract an array of bounding lat and lon for each division.. is it possible to do?
19
votes
6answers
613 views

Python for GIS on a thumb-drive

I'm looking at putting together a light Python install on a thumb drive that I can take to client offices and do some basic GIS processing. I'm thinking of installing the following: PyScripter ...
4
votes
2answers
300 views

Segmentation Fault (segfault) when using OGR CreateField() in Python

Receiving a segfault when running this very short script in Ubuntu. from osgeo import ogr, osr shpfile = 'Census_County_TIGER00_IN.shp' def cust_field(field): '''cust_field(shpfile, field) ...
8
votes
6answers
6k views

How can I calculate the orientation of each side of a polygon in ArcGIS 10?

I want to examine the orientation of each line in a polygon so that I can calculate their solar exposure. Each polygon represents a building, and has an associated height. For the moment, I just want ...
9
votes
3answers
1k views

How to populate an undirected graph from PostGIS?

This question is more related to resources that I might not have identified yet, although I've been searching the web for a while. In the project I'm working at the moment I need to run a ...
6
votes
1answer
1k views

Setting units in python using ArcGIS 10

I want to calculate the area of each polygon in a shapefile. How do I control what the units of measurement are? def getArea(shapefile): """Print area of polygons""" Rows = ...
7
votes
3answers
4k views

Problems setting up eclipse (with PyDev) for ArcGIS 10

I'm trying to use eclipse with PyDev to program in python. In Windows 7 x64, I've added a PATH environmental variable (PATH C:\Python26\ArcGIS10.0\python.exe;) and what I thought were the relevant ...
49
votes
15answers
22k views

Resources for learning Python programming with generic GIS goals in mind?

In your opinion, what is the best book/site to learn Python with GIS goals in mind? By "best", I mean: not very long (book) easy to understand (book/site) good practical examples (book/site) For ...
4
votes
1answer
609 views

GDAL Pixel Functions question

I am writing a program in python that converts raster files using gdal, and using VRT as an intermediate format. One of the things that i need to do is convert bands between different formats. I am ...
12
votes
7answers
2k views

How to implement value-by-alpha map in GIS?

I've been doing some background reading about cartograms recently and stumbled upon interesting alternative - value-by-alpha maps. Concept is described in more details here and full paper is ...
4
votes
2answers
791 views

Maturity of Mapserver mapscript C# bindings?

I've been thinking about possibly porting an internal custom GIS application built on top of Python / PyQt / Mapscript / GDAL-OGR / PostGis to C#. I was wondering about the maturity of the C# ...
3
votes
1answer
558 views

With CTM how can I get the latitude and longitude bounding box of a geoPDF?

Embedded in a geoPDF is info on the CTM - Coordinate Transformation Matrix. I am unfamiliar with this CTM. I know how to use python-numpy. How (or is it even possible) for me to use the CTM ...
6
votes
1answer
984 views

Altering composer label items in QGIS with Python

I'm only new to QGIS and Python so this may exists already, and hopefully be easy to do. What I'm hoping to do sometime in the future is build a map book generator using QGIS as the base. In order ...
2
votes
2answers
881 views

Any python script to convert a geoPDF to a KML embedded with a jpg link?

I have many geoPDFs. I want to turn them into KMZ or KML+JPEG using a python script. Any suggestions? SEE CODE BELOW
5
votes
5answers
5k views

How do I build a form within ArcMap?

I am building a file geodatabase using ArcGIS. The gdb is going to be distributed to dozens of 'stand alone' machines. End users are expected to populate the gdb with data. End users do have ArcGIS ...
5
votes
2answers
11k views

'Select by attribute' using python in ArcMap 10

I need to select a feature using SQL before zooming to it in python. What I'm looking for are replacements for the commented lines in this code: import arcpy parcel_num = "123456" mxd = ...
62
votes
12answers
48k views

Installing GDAL with Python on windows?

Can anyone explain how to install GDAL/OGR with Python on Windows? I have Windows Vista and I have tried following the information on the website and it does not seem to bind the exe files for me. ...
6
votes
3answers
3k views

Convert .mxd with embedded VBA command button to ArcMap 10

I'm trying to convert an .mxd file from an older version to ArcMap 10. The old version had two simple VBA scripts attached to toolbar buttons. I am trying to convert this .mxd to ArcMap 10. For ...
4
votes
1answer
2k views

How to clear python console in QGIS?

After running several hundred lines of commands (and getting their subsequent error statements...), it is nice to be able to clear out the console window and start clean. In the Python Console ...
5
votes
2answers
3k views

Using Qgis API and python, how can I return latitude and longitude of a point?

I have a point layer, that I'd like to return the Longitude, latitude using the qgis api. I assume I need to use QgsPoint
3
votes
2answers
4k views

Can I use python 2.6 with ArcGIS 9.3?

Is it possible to use Python 2.6 (or 2.7?) with ArcGIS 9.3? The official stance is no, not supported. There are a number of reports in the wild though that it can be done. How is this accomplished? ...
5
votes
1answer
1k views

Programmable buffers using GDAL and python

Is there a way to programmatically generate buffer layers for vector layers using GDAL and python?
0
votes
2answers
6k views

KeyboardInterrupt doesn't work when arcgisscripting module is loaded

The KeyboardInterrupt exception -- thrown when Ctrl-C, or Ctrl-Break on some machines, are pressed in a Python console window -- is commonly used to gracefully break out of long-process loops, ...
5
votes
1answer
784 views

Trip travel matrix on OSM data

Here's my situation: I'm modeling travel logistics I have 1,000 nodes, on my road network I'd like to generate the minimum driving time distance between all these nodes This process will be done 24 ...
3
votes
3answers
182 views

Is there a way to locally add links to an OSM data set

Here's what I'm trying to do: I'm modeling some transportation logistics data I want to test the effects of a "new highway" on existing travel demand The new road will be created from an arbitrary ...
5
votes
3answers
1k views

Can you create new annotation feature classes with Python in ArcGIS for Desktop?

I am working on a project that needs to create file geodatabases from scratch and I cannot find any information about how to make new feature classes as annotation with Python. Does anyone have any ...
6
votes
3answers
1k views

Is anyone successfully using arcpy.ExportMetadata_conversion?

I don't know if it is a bug or my lack of python skills, but I keep getting 'ERROR 000816 The tool is not valid' in my python script when I call ExportMetadata_conversion Initially, I was attempting ...
8
votes
7answers
1k views

How to integrate SAGA Python Modules into ArcGIS Desktop?

I have been having a look at SAGA (http://www.saga-gis.org/en/index.html) and it seems to have some nice tools for geoprocessing. I was wondering if anyone out there has had any luck bringing SAGA ...
4
votes
2answers
4k views

Assertion Error when attempting arcpy.mapping.AddLayer

Whenever I attempt to use AddLayer it gives me: Runtime error <type 'exceptions.AssertionError'> This is what I've been using: arcpy.mapping.AddLayer(MainDF, ...
5
votes
2answers
9k views

How to write a script that will automatically draw lines from one point to multiple destination points? (ArcMap 9.3)

I need to create lines from an airport to numerous destination locations. The destinations change often, so drawing them manually becomes tedious. I want to create a script that will draw them ...
1
vote
1answer
768 views

How to create a pop-up box if a condition is true in a table? (ArcMap 10)

I'm creating a script that will grab layout data from a table for the current Building Number of the current building my map series is on. It works fine, but I need it to pop up a window if multiple ...
9
votes
1answer
1k views

How to read/write from/to QGIS project file using Python?

I'd like to save the project-dependent configuration of my Python plugin inside the QGIS project file. Is this possible and what are best practices to do so?
7
votes
1answer
2k views

How to toggle layer visibility in QGIS using Python?

How can I toggle layer visibility in QGIS via Python API?
9
votes
3answers
10k views

How to create a button in Arcmap 10 to run a Python program?

I have a script that I want to run within ArcMap when a button in a toolbar is clicked, and so far I have only been able to make the script into a script tool. I need it to run as a command, not as a ...
9
votes
2answers
2k views

How to disable and enable drawing in ArcMap using Python?

The script that I'm writing repositions two data frames and sets their extents. When doing this, it redraws the entire Active View 4 times, slowing the script substantially. Pressing F9 or ...
4
votes
2answers
2k views

How does one build a Python script that exports to several output files?

I'm trying to build a Python Script that will receive one feature layer that will be clipped by several adjacent grid squares (each in a different shapefile) and output several shapefiles. Now, I've ...
16
votes
12answers
45k 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.
13
votes
1answer
4k views

How to have a python script self terminate in ArcMap10?

I have tried sys.exit, but it doesn't seem to work in ArcMap. Anyone know how to do it?
8
votes
5answers
1k views

Will there be a Python API for ArcGIS Server?

It seems like an obvious next step given the big push towards Python in ArcGIS Desktop at 10.0. Are there any limitations of Python compared to javascript, flex, etc that would prevent ESRI from ...