All Questions
154,937
questions
8
votes
4
answers
1k
views
Joining lines when direction is not known
I am struggling with this problem: I have a polyline made up of several segments. Each segment is made up of points, each point identified in 3D space by coordinates and elevation. Together, if ...
user2117
9
votes
2
answers
9k
views
Creating line of varying distance from origin point using Python in ArcGIS Desktop?
I'm trying to create a line feature from a single point, using a set distance and angle using ArcGIS and Python (ArcPy).
I have a point at these coordinates: X = 400460.99, Y = 135836.76
From ...
- 367
4
votes
1
answer
209
views
Intergraph TerramapServer and PostGIS
Has anyone ever used the two of them together, and if so, any special caveat to be aware of ?
Furthermore, does it even make sense to use PostGIS / do TerramapServers have their own storage format ...
- 745
4
votes
0
answers
911
views
Why doesn't the gml 3.1.1 schema validate with xmllint? [closed]
Running xmllint on the gml 3.1.1 schema fails, even though the release notes claim that this release was created to get the schema to validate using 'common tools'. There's questions about this on ...
- 663
17
votes
9
answers
14k
views
Seeking Mobile Data collection software recommendations?
What COTS software is available to do mobile data collection, with GPS positioning. Map display not required. I'm looking across the board (platform wise).
I'm already aware of...
RhinoSpect
ArcPad
...
2
votes
1
answer
266
views
Are there any efficient methods for processing ArcGIS-based database tables outside of the ArcEtc program library?
Let us say, for the sake of argument, that you are working with a table that is over 2 GB in size (so .dbf is automatically ruled out... right?). To even create such a document, ArcGIS requires that ...
- 4,308
3
votes
1
answer
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) ...
- 427
2
votes
2
answers
2k
views
ArcMap TextSymbol in ArcObjects?
I'm looking to do the following. Create a point on a map at a given coordinate (x,y) and then display text at that point. Right now I can create a shape file but nothing is displayed on the map. ...
- 511
50
votes
5
answers
10k
views
Debugging ArcPy scripts
I have written many Python scripts using ArcPy in ArcMap 10, and so far my only means of debugging is restricted to printing messages to the geoprocessing results window using arcpy.AddMessage().
Are ...
- 7,275
6
votes
1
answer
890
views
Best routing algorithm for this scenario
Trying to work out the most appropriate routing algorithm to use for this situation. Even better if it's available as part of pgrouting or similar..
Here's the requirements:
Specified date/time for ...
- 511
1
vote
1
answer
4k
views
How to handle 500 Internal Server Error with ESRI Silverlight API
I have a simple AGS map service. I accidentally specified an invalid SRID explicitly in my Silverlight XAML:
<esri:Map x:Name="Map" IsLogoVisible="False">
<esri:Map.Extent>
&...
- 1,987
2
votes
5
answers
1k
views
protecting kml access to google only
I have a large amount of data (thousands of polygons) that I want to share with people through my site. I want them to be able to view the polygons, and due to the large amount of data, I am not ...
user2110
11
votes
3
answers
6k
views
What are Valid feature class and table names in ArcGIS Desktop?
What are the rules for naming valid feature classes and tables in ArcGIS Desktop, and is there any supporting document which can explain all the dataset naming limitations?
- 1,906
18
votes
4
answers
1k
views
Implementing ringmaps in ArcMap
In a recent article by Stewart and colleagues in IJHG I stumbled upon interesting technique of visualizing data using ringmaps. Some more information referenced in the article about this technique ...
- 10.5k
105
votes
4
answers
37k
views
What are the pros and cons of PostGIS geography and geometry types?
My company uses geometry (the_geom) data type for storing geospatial data.
I've recently been acquainted to the concept of geography (the_geog) data type which, as I understand it, stores the SRID ...
- 6,700
2
votes
3
answers
670
views
How to stack labels
How can labels be stacked? The data has multiple points stacked at the same point location. All of the labels from all of the points at one location need to be stacked in a list next to the "group" ...
- 21
2
votes
1
answer
1k
views
How to use GRASS with HEC-RAS?
I am trying to use HEC-RAS for the flood modelling of my flood simulation. How do I use the text file output of HEC-RAS with the GRASS script r.inund.fluv?
- 1,367
42
votes
18
answers
25k
views
Why do you use ArcGIS for Desktop?
I'm new to GIS, having only dabbled with ArcGIS for Desktop for about 4 weeks in 2007. The business I am at wants to target writing complete solutions that involve GIS as it would benefit their ...
21
votes
2
answers
38k
views
Converting projected geoTiff to WGS84 with GDAL and Python
I am VERY new to this whole GIS thing.
I am trying to convert some projected geoTiff images to WGS84 using gdal in python. I have found a post that outlines the process to transform points within ...
- 313
10
votes
6
answers
7k
views
Using ArcGIS Online Base Maps without Esri Software?
Since the end of January 2011:
"ArcGIS Online map services are
available at no cost regardless of
use." - http://www.esri.com/software/arcgis/arcgisonline/standard-maps.html
However, the ...
- 14.2k
3
votes
1
answer
762
views
How can I do client side linear referencing in an Esri Silverlight/WPF app?
I have an Esri Silverlight/WPF UI with a mapcontrol and a slider. In the mapcontrol is a graphics layer with a single polyline on it, created using coordinates from a layer in a mapservice. The ...
- 25.7k
4
votes
2
answers
3k
views
How to integrate Proj4 into an iOS / iPhone project?
This may be overkill, but I need to reproject a point coming from the CLLocationManager, which is in EPSG:4326, to Dutch RD (Double Stereographic, EPSG:28992) in my iOS application and I am using ...
- 1,684
21
votes
8
answers
11k
views
What are useful websites for scouting GIS related jobs?
What are useful websites for scouting GIS related jobs?
6
votes
3
answers
2k
views
Modeling Telecommunications Infrastructure in GIS?
I am looking for resources that will help me to model telecommunications infrastructure of a small town/campus in GIS. Can anyone suggest where to look for:
A telecommunications GIS data model (I ...
- 493
3
votes
3
answers
2k
views
How to avoid "No Data" from Tiled Map Service in Silverlight
I'm using the latest and greatest Silverlight with ArcGIS Server 10 and when I do a search for features in my operational layers (wells) and zoom into them I'm seeing "Map Data Not Yet Available" ...
user2097
7
votes
4
answers
3k
views
Displaying/feeding US census/tiger data into Google Maps API?
Let's say I want to display age, income, etc based on census block groups on Google maps.
How can I do this and also to allow simple queries?
- 8,523
5
votes
1
answer
925
views
Setting IActiveView extent?
I'm having a problem when setting the IactivewViews extent. I have done it the same way on other places and it does work. In here, it just throws me a LoaderLockException.
// OLD CODE
...
- 6,278
0
votes
1
answer
1k
views
Openlayers toggle Marker controls and update information in external form fields
I am setting a form (for multiple addresses) where users can click on map by creating a marker for each address they want to input. Users can only create one marker per address and once the marker has ...
user2096
2
votes
0
answers
620
views
OpenLayers WMS overlay tile projection
We are using OpenLayers for our GIS Application and we have base files from Ordinance Survey for UK maps.
For creating WMS layers, we are generating tiles of 256 x 256 through Sharpmap Library but ...
user2095
2
votes
1
answer
1k
views
Selecting object(s) by mouse using ArcGIS Engine?
I've got a standalone program using ArcGIS Engine, showing a map on the screen like this:
AxMapControl _mapControl;
AxToolbarControl _toolbarControl;
// in constructor:
_mapControl = new ...
- 199
6
votes
2
answers
458
views
Is GeoNetwork an appropriate choice when I need to automatically create large amounts of metadata?
I have inherited a GeoServer installation publishes ~13,000 - 18,000 WMS layers in a dozen or so datastores on a 12 hour schedule. Other than what's in the GetCapabilities document, there is ...
- 663
9
votes
1
answer
977
views
ESRI HTTP where query
A friend and I are currently creating a pretty straight forward LINQ to ESRI library that sends HTTP queries to an ArcGIS MapServer and then parses the JSON response appropriately.
Everything is ...
- 743
10
votes
4
answers
9k
views
What causes shiny artifacts in Google Maps imagery?
Do you know what causes artifacts like this one?
Source: http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=embelgasse+wien&aq=&sll=37.0625,-95.677068&sspn=60....
- 83k
14
votes
2
answers
4k
views
Google Fusion Tables vs Amazon Web Services: which is better for GIS data?
What are the pros/cons for storing storing spatial data in Google Fusion Tables versus Amazon Web Services?
Factors would include: Cost, performance, ease of update.
9
votes
6
answers
598
views
What GIS Data should Amazon add to its Public Data Sets? [closed]
Amazon says:
If you have a public domain or
non-proprietary data set that you
think is useful and interesting to the
AWS community, please submit a request
below and the AWS team will ...
1
vote
1
answer
313
views
The resulting maps from a r.mapcalc script is not computed properly
This post is a continuation of my other post Why is my controlling shell script not working?. I created another post because this contains a separate issue that I encountered with the same scripts of ...
- 1,367
35
votes
5
answers
47k
views
Comparing different open source GIS servers?
I currently know the following open source GIS servers:
Geoserver: java based, vector and bitmap support, also supports. Is now on par with mapserver (performance-wise).
mapserver: c/c++, used to be ...
3
votes
2
answers
3k
views
Zooming & panning to selected objects using ArcGIS Engine?
I'm writing a program using ArcGIS Engine, and need to zoom & pan into the map to show the selected content.
Loading and displaying the map does work using something like this:
AxMapControl ...
- 199
4
votes
2
answers
31k
views
Selecting points under polygons using ArcGIS Desktop?
I have a point layer and a polygon layer (created from the point layer using local convex hull isopleths). I would like to be able to select only those points laying within the multiple polygons (all ...
- 111
4
votes
1
answer
742
views
Building WKB from geometry using ArcObjects?
I have some points in an array,stored by user click on the map in ArcMap,and I want to build a polyline and create a Well Known Binary sequence.
I use IPointCollection interface to add this points to ...
- 826
12
votes
2
answers
2k
views
Tiling Vector data without losing geometrical and topological information
I am trying to figure out a way to sub-divide a vector based map into smaller blocks. I can tile the map based on different strategies such as q-tree. However, it is unavoidable to cut some polylines ...
- 357
2
votes
3
answers
1k
views
ArcObjects and non-spatial table?
I am a new Arc Objects user, with little ESRI experience.
We are using VBA to create a spatial report on a Map Control using a mdb table. The mdb table contains a Lat and Long field, and this data is ...
user2078
6
votes
1
answer
998
views
3D visualization for marine navigation
Is there anyone who has some experience or knowledge on 3D visualization and/or GIS softwares capable of displaying 3D bathymetric data and 3D ship model together? Nearly all GIS softwares work with ...
- 61
2
votes
3
answers
656
views
d.out.file is not working
I'm trying to use 'd.out.file' to save the displayed map to a PNG file. It failed and produced this message: "Command 'd.out.file' not yet implemented in the GUI. Try adding it as a command layer ...
- 1,367
1
vote
1
answer
810
views
How to export a png file from a raster file? r.out.png has an error
I used r.out.png to export a png file, but it produced this error:
(Sun Feb 27 00:26:32 2011)
r.out.png input=raster_bulacanElevation output=...
- 1,367
3
votes
1
answer
2k
views
Is there a way of cutting a raster map that is displayed in the GRASS GIS Map Display?
I have a raster map that I generated from cropping/masking from a bigger raster map. It produced a map with only a portion of not null values. I only want to have a map that is zoomed in to the ...
- 1,367
1
vote
2
answers
1k
views
Run Macro automatically in ArcMap [closed]
I am involved on a project which is about Generating 2 maps via running macros in Arcmap 9.3.
It works fine when user push the "run macro" button but now I want to call arcmap from a web ...
user2072
9
votes
3
answers
498
views
How can Flocking Algorithms be used in GIS?
The first flocking algorithm was written by Craig Reynolds in 1986. A recent browser implementation can be found here.
&...
- 14.2k
3
votes
1
answer
1k
views
gp.Describe() on sde table
Python newbie needing help with a simple task. I'm trying to create a list of stand-alone tables in an sde workspace.
Code below works just fine to list feature class names and paths and table ...
- 181
12
votes
2
answers
5k
views
Difference between Geoserver stores: ImageMosaic, WorldImage, ImagePyramid
What are the differences between the Geoserver stores ImageMosaic, WorldImage, and ImagePyramid? I noticed that ImagePyramid is no longer included in the latest Geoserver. Is one of these more ...
- 319