-1
votes
1answer
267 views

Finding the area of a polygon feature in a shapefile [closed]

Excuse the very simple question. How do i find the area of a selected polygon feature in a shapefile?
3
votes
1answer
959 views

Obtaining envelope of data frame in Layout using ArcObjects?

This is to expand on How can I transform layout page units to map units? How can i programatically obtain the corner coordinates (in page units) or the envelope of the data frame in layout view? I ...
3
votes
1answer
384 views

Why does QGIS Polygonize ignore the no data value?

I'm running into an issue georeferencing a number of PNG image files. The files simply contain an image where each pixel is either transparent or a single color, forming a coverage mask. In the past, ...
4
votes
2answers
791 views

Problem with multiple feature selection

In an attempt to retrieve all features (point geometry) that fall in a selected polygon, I get the error this.layer.addFeatures is not a function. My code is as shown below: function ...
1
vote
1answer
872 views

web gis application with geotools?

I need to create a new gis application with OpenLayers and PostGIS. I think that Geotools is a good choice for the Layer between these two. I thought about embedding geotools in a web application ...
2
votes
1answer
733 views

Triangulation Algorithm

I want to track device using triangulation algorithm. It works fine with 3 BTS stations at 3 different locations. What should I do if only 1 or 2 BTS exists.
2
votes
3answers
980 views

Extract human-relevant data in an OpenStreetMap dump?

I downloaded a full XML dump. While there are lots of nodes and ways, I want to filter out only the human-relevant data. By human-relevant, I mean neighborhoods, restaurants and landmarks are ...
5
votes
1answer
141 views

Tools for discovering spatial data defects

Spatial data often have defects that may include incomplete polygons, sleathers (non-uniform administrative boundaries), overlaps, having points that belong to more than one polygon, etc. I have a ...
3
votes
3answers
1k views

Add date to feature class name?

I still working on my big project, big at least for me, but I am currently stuck on this: I have a lots of .shp, that I want to move to a gdb. While creating a feature class, I want to add date ...
1
vote
0answers
240 views

'Smart' symbology for categorized Point data which is prone to clustering: ArcMap or Flex API?

I'm working on what will become an interactive online map showing things like municipal services and leisure activities in a certain area. They exist as Points, and are categorized as 'police ...
2
votes
2answers
368 views

Problem with Coordinate Tolerances when I export my .shp files to .mdb

When I export my shapefile to a personal geodatabase using ArcMap, the result is not the same as the original database. I do not know how to solve this problem.
3
votes
1answer
910 views

Polygon with the same points over and over

I am in the process of reading shape files (provided to us by the vendor dealing with GIS products) using a C# program and loading them into a SQL database. I first read the text for the shape and ...
1
vote
3answers
965 views

Select by Attribute --Top 500 values selection in attribute table - ArcGis

Is there any way we can select top 500 values in attribute table? I tried by sorting area field ascending/descending... but I can't count big numbers to select. In microsoft excell we can do know, ...
8
votes
5answers
2k views

Are there GUI resources for gdal and ogr?

For those who are new to the programming side of GIS, I feel that a lot of great tools and resources are inacessible. I am interested in GUI based wizards for handling geoprocessing with libraries ...
1
vote
1answer
2k views

GeoToolKit conversion from lat/long to UTM

What is the proper way to convert lat/longs to a UTM coordinate system using the Java geotoolkit API? I have not worked with GIS software before, so maybe what I am trying to do is not directly ...
3
votes
1answer
210 views

Why may Maplex options be grayed out?

I have the Trial Version for ArcEditor 10.0 with the extensions. Using Maplex/Labeling Manager, after clicking Property, I go to "FITTING STRATEGY". all the lables (stack, overrun, reduce font size, ...
1
vote
1answer
779 views

How to autoclamp to ground automatically in Google Earth using a dynamic KML created from ArcGIS Server 10

It loads as an absolute everytime so terrain must be turned off to see the lines. Any idea how to get it so they default to clamped to ground? Using newest version of GE.
7
votes
1answer
2k views

Reset local memory in ArcMap 10

I often am unable to delete files due to a lock or need to reset the data frame coordinate system. Very often starting a new session of Arc will allow certain geoprocessing or data management tasks ...
9
votes
3answers
6k views

Best method to aggregate 1m DEM mosaic to 10m DEM

I have a mosaic of a 1m LiDar derived DEM. I need to output a subset of the data as a 10m DEM. I am currently using the aggregate tool in ARCGIS 10 to produce a mean value for each new 10m pixel. ...
1
vote
1answer
433 views

Transforming layout page units to map units using ArcObjects?

I am trying to build an add-in that will create a polygon from the current map extent. This is not a problem in Data View where I can easily get the envelope of an iMxDocument:iActiveView in data ...
18
votes
12answers
21k views

Python GDAL package missing header file when installing via pip

I asked this question on Stack Overflow before I realised this site existed. As this site it more appropriate, I'll ask it here too. I'm trying to install gdal from pip pip install gdal inside a ...
4
votes
1answer
1k views

merge selected features and programming

I have a shape file with UK districts and unitary authorities. In the past, using commuting patterns, I worked out a new geography which is close to travel to work areas. I now would like to create a ...
2
votes
0answers
166 views

Geolocate stores inside a mall?

OpenStreetMap lists the malls in Albuquerque, but not the stores inside these malls. Using the in-mall map/directory, wouldn't it be easy to add stores inside the mall? Is anyone doing this? ...
5
votes
1answer
282 views

QGIS Globe UnsupportedOperationException

My QGIS Globe is not working: After starting it, that massage pops up in a endless loop: UnsupportedOperationException: GeometryGraph::add(Geometry &): unknown geometry type: ...
3
votes
3answers
884 views

Topographic correction (for land use classification) with SAGA or GRASS

Is there a module in GRASS or SAGA (or a alternative open program) to do a topographic correction of a landsat image to enhance the land use classification? Thanks! Martin
9
votes
4answers
4k views

Python script - how to avoid exclusive schema lock error?

I have a script for updating some features on my database every night (just for copying and replacing some features). This features are "read-only". My problem is that I can't avoid that these ...
1
vote
3answers
971 views

PRJ file for Stereo70 S-42 projection?

I receive lots of Romanian maps with the projection STEREO70 with Datum "S-42 for ROMANIA". I have only found the "Stereo 1970.prj" by ESRI, and when I open the maps with my GIS software the ...
4
votes
5answers
5k views

Why does export to AI rasterize all my vector layers?

I have no raster layers in my map document and no transparencies. Yet the map is rasterized when exported to AI. (Map frame and coordinate grid are vector graphics but everything in the map itself is ...
1
vote
2answers
1k views

Are there any free tools that can view and edit ArcGIS Map Packages?

I'm looking for a tool that can open ArcGIS Desktop 10 map packages (.mpk files) and allow in a simplified way for a third-party to add geology cross sections and well points. Any suggestions? It ...
0
votes
1answer
870 views

Compiling Grass from Source in Ubuntu

Hi a while ago I drafted a semi-universal guide on how to compile GRASS GIS on Ubuntu. Because I had enough emails asking more details I thought to post it here for everyone and if possible to ...
14
votes
4answers
810 views

Migrating to Linux from Windows

I am looking at switching over a computer from Windows to Ubuntu. I have been a Windows user all my life and been using GIS for over a decade. I am curious about the migration to Ubuntu. Mostly, ...
2
votes
1answer
187 views

Can I use a Geotools raster layer in a Geomajas webapplication?

I am working on a Geomajas web application and have a Geotools RasterLayer (a GridReaderLayer to be precise) that needs to be integrated with the map in the Geomajas app. I have been searching the ...
1
vote
2answers
453 views

PostGis, export Svg in pixels

I'm new to GIS. It is very intersting. I have installed Postgis, insert shapefile, get data in SVG without problem (ST_AsSVG). Now, I'd like to export the same svg but in pixel to add it on top of ...
2
votes
1answer
747 views

How to design a road with a certain slope

Is there a way that you want to connect two different points of altitude with a constant slope of 7% or another, to draw a line in the 3D model?
1
vote
2answers
2k views

ArCGIS Server 10/10.1 And Sql Server 2008

Is there any compulsion that SQL server 2008 and ArcGIS server 10/10.1 should be installed on same server machine and is it possible to install SQL server 2008 and ArcGis server on separate server ...
2
votes
2answers
222 views

ArcGIS cached map service sometimes pausing

I have published an ArcGIS service based on a MXD I have generated the cached tiles on a shared NAS. When I access the Map Service with the build in js admin viewer ...
1
vote
1answer
341 views

problem after merge shapefiles, can't show it on OpenLayers with GeoServer

I have 5 .shp files, after merge it with geomerge, I can't use it on OpenLayers with GeoServer. it's only show white layer and when i click it, it show error message: Internal error occurred ShapeType ...
4
votes
1answer
3k views

If statement in ModelBuilder to check if field exists

I'm trying to create the following in ModelBuilder: Set input feature class if field1 exists execute the processes in branch1 else add field1 execute the processes in branch2 ...
11
votes
1answer
760 views

How to convert fake donut holes in polygons to real ones?

I have this problem where I have to import shapefiles into our system which must be geometrically valid, but the software that everyone uses to produce them seems to output files where every polygon ...
1
vote
0answers
116 views

How to compute a map-to-screen transformation?

Every projection calculation I have come across dealing with the Lambert Conic projection converts the given Lat & Long to meters. So now the magical question: how on earth do you take the meters ...
6
votes
1answer
119 views

Understanding null shape type

I have some shapefiles that I am reading and then loading into tables in the database. The shapefiles with no zoom (eg. "au_postcode") have no shapes with type null. When I tried to load a shapefile ...
10
votes
1answer
1k views

Conflate (merge) private shapefile data with OSM data

Background Downloaded Alberta OSM data from Geofabrik and have it running on a private Linux server using PostgreSQL 9.1, PostGIS 2.0, Mapnik 2.1.0, osm2pgsql, Apache 2, mod_tile, renderd, and ...
2
votes
1answer
365 views

Does ArcMap/ArcPy support creation of textElements using Python?

From what I can tell python at ArcGIS Desktop 10.0 cannot create new textElements nor GraphicElements. Yet, 10.1 seems to support the ability to at least create a clone, of a existing GraphicElements, ...
1
vote
2answers
799 views

OpenLayers GeoJSON: limit significant digits to 6 when using write()?

Is there a way that OpenLayers.Format.JSON write() method to serialize coordinates using 6 decimals only ? Example: instead of http://pastie.org/4200997 to have http://pastie.org/4200994
2
votes
2answers
180 views

Are there no italic fonts in Print Composer?

QGIS 1.7 doesn't seem to have an 'italic' choice when annotating a map in Print Composer, only 'regular' or 'bold' fonts, a rather surprising omission if correct. Is there some other way to create an ...
7
votes
3answers
2k views

Convert an arbitrary meta-data-free map image into QGIS project

My background: experienced programmer, amateur historian, complete beginner to GIS (so I'm using QGIS). I did learn to use the QGIS georeferencer tool though. The input: suppose I have an image like ...
3
votes
4answers
3k views

QGIS Web Client in Windows does not load map

I have installed QGIS (1.8 Lisboa) desktop and server on a Windows XP machine. I am now trying to configure the QGIS Webclient. I downloaded the zip file from GitHUb, and made the changes to the ...
4
votes
1answer
2k views

Python 3 support in QGIS?

As python3 is getting standard more and more I wonder wether there is or will be support for python 3 in QGIS?
4
votes
5answers
5k views

Add UTM labels to grid in qgis

I try to use qgis to create a custom topographic map for outdoor use: UTM, 1:50000. What these maps usually have is a 1km x 1km grid, which at the bottom is labeled with a shorthand for the ...
2
votes
1answer
402 views

Geo Tiffs overlap in QGIS

I am trying to stitch together several GEO Tiffs that come in pairs (north -south) but when i load them into QGIS they display completely overlapped. That is the north south pair match up ok (display ...

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