Geoprocessing is a GIS operation used to manipulate GIS data.
18
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10answers
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What are the existing solutions to automate generalisation/simplification of geographical data?
I am looking for existing solutions (softwares, libraries, methods, etc.) to automate the generalisation/simplification of geographical data as presented there, and also there.
How do you proceed ...
12
votes
5answers
4k views
How to get the extent of each polygon in a shapefile?
In arcgis 10 and python I want to get the extent (xmax, ymax, xmin, ymin) info of each of the polygons in a shape file.
I can get the extent of the whole shape file using
...
10
votes
4answers
2k views
Simplifying polygons to linestring
I would like to simplify some polygons that represent rivers into linestrings. I assume that holes in polygons can be omitted. Anybody has some good idea how to simply do it?
It would be nice, if it ...
7
votes
11answers
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Logging GPS and Accelerometer Data - Device Suggestion?
I am looking for a device that can track my location (lat,long) and speed all day long. Perhaps, I need GPS and accelerometer data bundled together.
What I want to do is to log my daily activities. I ...
7
votes
2answers
2k views
Issues with large datasets
I am trying to run an Intersect process in arcgis 10 sp 3 with 2 file sets (aspect and slope) from up to a 1m DEM across an area of 65,000sq km. The aspect has 9,930,384 records and the slope has ...
6
votes
3answers
659 views
How can i split by attribute in ArcGIS 10?
I'd like to split a single shapefile to multiple shapefile by attribute. I found ET Geowizard to do this but it's not free . I arcscripts.esri.com i found a tool named "SplitLayerByAttributes" but it ...
31
votes
9answers
2k views
Alternatives to using Arcpy
I seem to use ESRI's Arcpy site package for virtually all of my python geoprocessing. To ESRI's credit, these are an incredible suite of tools that can help accomplish a great deal. However, I would ...
18
votes
4answers
2k views
Is there any model builder in QGIS or other open source GIS?
Like the model builder in ArcGIS Desktop to run simultaneous geoprocessing tools, is there any model builder available in QGIS or an open source GIS software.
5
votes
4answers
455 views
How to aggregate detached polygons?
Is there any open-source library to aggregate detached polygons? I know that there is a tool in ArcInfo, but it is commercial.
5
votes
2answers
364 views
Is there a RESTful way to cancel a GP Job?
I have an asynchronous gp service that I can successfully run and cancel from within Arcmap.
Using fiddler I see that arcmap communicates with the GP service via SOAP.
I'd like to cancel the job ...
5
votes
1answer
1k views
ArcGIS: inside buffer with attributes?
How can I create buffers for polygons that a) lie only inside the polygon boundary, and b) know who their parent is?
An example of where this is useful is First Nation Traditional Territories. There ...
8
votes
2answers
937 views
Is there an automated/geoprocesing tool In ArcGIS to slice, clip, or cut polygons using polylines?
Looking for a simpler method here.
I am trying to split up / cut / slice existing polygons by using existing poly-lines. An example would be splitting a water body or land parcel at the point where a ...
11
votes
2answers
1k views
Is there a way to automate the preprocessing of LANDSAT data?
I'm currently enrolled in a remotesensing course, using LANDSAT data.
Part of my course is about standardizing the scenes based on radiance values. I assume that because this is such a tedious task, ...
11
votes
4answers
2k views
Simplifying adjacent polygons
I encountered a problem simplifying set of polygons that are adjacent. If I simplify each polygon separately with the Douglas–Peucker algorithm (which is used by many open source tools), the resulting ...
5
votes
4answers
996 views
explode overlapping polygons to new non-overlapping features
Given multiple polygons that overlap in multiple ways, I would like to export from this feature all polygons that don't overlap with others iteratively. The product would be a number of features with ...
9
votes
3answers
2k views
Divide a complex shape file into a grid
I have a decently detailed shapefile with polygon/multipolygon features (the file is about 500mb). It's actually a shapefile of the entire world, with the features representing coastlines. I need to ...
8
votes
1answer
234 views
How to find differences between shapefiles?
Every month I have to QA/QC some streets data for an entire county (over 47,000 records). The first step is to compare the two files. Currently, I'm using a tool that was created in house via VBA ...
7
votes
1answer
898 views
How to find the mid-point of a line in arcpy
How can the mid-point of a polyline be calculated using the geoprocessing framework, eg in a Python script?
The polyline.centroid property returns The true centroid if it is within or on the feature; ...
4
votes
2answers
230 views
Does Calculate Value (Model Only Tool) work correctly in tools run in Batch?
Am I correct that if my model has a model-only tool (Calculate Value), and then I run the model as a batched process, it will not run the Calculate Value expression?
I wrote a model to upload, ...
4
votes
6answers
5k views
Points to Polygon
I've millions of points collected for lithology layer. They have used a coding for different types of rocks. I need to create a polygon around the extent of similar points. What is the easiest way to ...
10
votes
2answers
1k views
Issues with geoprocessing with .NET
There are some nice features in ArcToolbox we can use, but for some reason, this is NOT working properly. It doesn't even throw me an error.
My software is running inside ArcMap, so no need to ...
7
votes
3answers
2k views
What ArcGIS 10 geoprocessing tools support exporting tabular data to CSV?
I have found that most if not all geoprocessing tools that allow tabular output are limited to geodatabase tables and DBF files for supported output formats. Are there any that also support CSV ...
6
votes
2answers
364 views
reorder a polygon shape file (not sort)
I've written a script which produces a polygon shape file of the extents of all the thousands of rasters in our library. I want to organise the FID so that the files with the largest extents are on ...
5
votes
2answers
2k views
Cannot get rid of lock on file geodatabase and feature class created in Python script
I have a python script, (for ArcGIS 10), that creates a new file geodatabase, creates a new feature class in that file geodatabase and then reads data from an SDE feature class to populate the new ...
6
votes
1answer
338 views
How to calculate te area between contour lines on a DEM with Qgis 1.8?
Does anyone know how to calculate the area in km² for each altitudinal band (between 100 and 200, 200 and 300...) based on a DEM? I added the contour lines with a distance of 100 metres but could not ...
5
votes
3answers
924 views
How to create spider diagrams (hub lines) in PostGIS?
I'm rather new to PostGIS but I have done a lot of reading. One thing that I have been searching for is a function that allows users to create a "spider diagram" (also called "desire lines" or "hub ...
4
votes
5answers
8k views
For every point, distance to nearest polygon of type X?
In ArcGIS how might one calculate as an attribute value the distance to the nearest polygon of type X? Say we have a point layer of wildlife observations and we want to know how far each of them is ...
3
votes
3answers
2k views
How to batch clip to a single-part shapefile using ArcGIS 9.3 and Python 2.5?
How do I clip a shapefile to a single-part shapefile using ArcGIS 9.3.1 and Python 2.5?
Example: I have a set of lines (lines.shp) I am trying to clip to each record in a shapefile called Grids.shp
...
2
votes
2answers
438 views
ESRI Geoprocessing Script : Runs Fine in Desktop - Crashes as Geoprocessing Service
I have a small and simple geoprocessing script that I am trying to expose as a geoprocessing service in ArcGIS Server 10 SP4. The script is below. Pardon the hard-coding...
With the hard-coded ...
2
votes
2answers
793 views
ERROR 999998: Unexpected Error
I’m new with Arc 10, and I'm struggling alot.
When using Geoprocessing I’m getting the same error or message again and again.
"ERROR 999998: Unexpected Error"
I have checked all the settings I can ...
2
votes
1answer
386 views
How to control which Fields are exported in ArcObjects? (via Field Mapping)
In ArcMap 10.x, if you use the Export Data command on a layer that has hidden/disabled fields, those fields will not be present in the created feature class/table. My question is simple: how do you ...
0
votes
1answer
293 views
ArcGIS/arcpy: Can a variable be set to reference an in_memory workspace object?
This is an offshoot question related to a question I posted earlier. I have the following arcpy code that inputs a Python list of polygon geometry objects to the Union_analysis tool, which then ...
23
votes
2answers
962 views
Streamlining Python Code for Big Data
I have Python code which is designed to take point shapefiles through the following workflow:
Merge points
Integrate points, such that any points within 1 m of each other
become one point
Create ...
15
votes
4answers
481 views
How to handle TIME in GIS?
Is there any way or any idea on how to handle Time attribute in GIS? For example, which are the ways to specify that an object is at a place at a given time interval and them it is in another place ...
12
votes
4answers
400 views
Mirror of Michigan State University's Python geoprocessing course materials
Been learning geoprocessing with Python using MSU's GEOG 825 ( python geoprocessing ) course. Unfortunately the link is dead now. I know this is a long shot but does anybody have a copy of the ...
20
votes
8answers
1k views
How to easily shift all features in a vector dataset?
Let's say that I put together a Shapefile and all the features have their vertices shifted by a constant amount. What's the easiest way of shifting all the features (hence the (x,y) position of their ...
7
votes
4answers
2k views
How to develop GUI in Python for geoprocessing?
I want to develop GUI in Python for geoprocessing, but I don't know what is the best GUI tool or library (Tkinter, PyQT, wxPython) for geoprocessing? Can I use PyQT for GUI programming in ArcGIS?
19
votes
8answers
1k views
Is there an architecture for distributed geoprocessing?
Suppose I have 50 computers on my LAN. Each computer has a geodatabase for all parcel polygons in a particular state in the US.
I'd like to write a geoprocessing task that finds all parcels valued ...
6
votes
1answer
486 views
Grouping map points into fixed cluster sizes
I have a dataset of 655 lat/long pairs which I'd like to split into about 100 groups. A group should have 5-10 pairs which are geographically close to each other. Dense groups should have more ...
10
votes
2answers
1k views
Is there a Free Aggregate Points tool out there for ArcGIS 10?
I need to do some Getis-Ord analysis but first I need to aggregate my points. I know of XToolsPro, but the aggregate points function is locked and you must purchase a license to use it. I am ...
6
votes
1answer
185 views
How can I get more verbose messages from a GP service?
When I run a tool I've published as a gp service, the only messages I get are these:
esriJobMessageTypeInformative: Submitted.
esriJobMessageTypeInformative: Executing...
...
2
votes
3answers
1k views
Does ArcGIS 10 have a Geoprocessor Programming Model by using Arcpy?
Does ArcGIS 10 have a Geoprocessor Programming Model by using Arcpy?
is it possible to use ArcGIS 9.3 Geoprocessor Programming Model within ArcGIS 10?
9
votes
4answers
819 views
Programatically split a polygon with a line
In looking at this question, it occurred to me that I am not sure how one would go about using geoprocessing tools in ArcGIS to split a polygon with a line programatically.
Manually, you would use ...
8
votes
6answers
411 views
PostGIS: Assign ID of point in layer A to closest point in Layer B
This should have been an obvious precursor (that I didn't ask) to my other question:
PostGIS function to create spider diagrams?
If I do not know the relationship between a point in layer A (stores) ...
7
votes
1answer
77 views
Reduce processing time in Erase function using Arcpy in IDLE
I am processing 18,000 feature classes (saved in a file GDB), each with ~500 records (polygon features) in ocean areas, and I am running a script to remove area overlapping with the coast, using the ...
7
votes
4answers
3k views
Find Clustered Points Within X Distance with N Points
We're planning on doing some cluster analysis exposed as a geoprocessing service in ArcGIS 10 - specifically these two:
Cluster and Outlier
Hot Spot
But we have to meet a specification for cluster ...
6
votes
1answer
442 views
Is there a way to access QGIS plugins in Python?
Is there a way to access QGIS plugins in Python? I'd like to write a script to do some geoprocessing, and I'd like to use the clip, regular points and convex hull tools in fTools, as well as the Road ...
6
votes
4answers
2k views
Compiling Python Scripts That Use ArcGIS Geoprocessing Tools
I've been coding with Python for several months now and have developed some reasonably complex scripts for primarily geoprocessing tasks. That being said, I'm still learning a lot as I'm coming from a ...
5
votes
1answer
150 views
Simulate (Mock) GPS Tracks
I have the following scenario:
1) I need to create GPX files for use in testing of a mobile device.
2) The tracks to be described within will span large distances over long time periods (i.e. it's ...
5
votes
1answer
730 views
Get shape filename in attribute field using field calculator
I apologize for crossposting against the ESRI geoprocessing forum, but it seems like this one gets answers. I'd like to have a modified append tool (ArcToolbox) that takes multiple shapefiles with ...
