5
votes
1answer
2k views

Extracting Lat/Lng from Shapefile using OGR2OGR/GDAL [closed]

I'm trying to extract lattitude/longitude values for the streets in this shapefile: http://gispub02.sfgov.org/website/sfshare/catalog/stclines_streets.html I've seen it reommended in many places that ...
13
votes
4answers
421 views

Secure online GIS for sensitive data?

My company I started working for is looking to move from ArcInfo and MapPoint to an online GIS for easier data access/availability. Obviously the GIS capabilities needed are rather basic, but ...
9
votes
3answers
1k views

Speeding up Python calculated timestamp field in ArcGIS Desktop?

I am new to Python and have started to create scripts for ArcGIS workflows. I am wondering how I can speed up my code to generate an "Hours" double numeric field from a timestamp field. I start with ...
3
votes
3answers
715 views

Large scale geoprocessing through ESRI REST interface?

A typical limitation of web based processing is that urls are limited to 2 thousand characters for a GET request. From my understanding of how the ESRI Javascript API works, JSONP is utilized to ...
2
votes
2answers
2k views

How to perform trilateration using 3 lat/lon points without distances?

I read this thread Trilateration using 3 latitude and longitude points, and 3 distances explaining about trilateration using 3 latitude and longitude with measured distance. The problem is I want to ...
1
vote
0answers
519 views

WFS success with error

I am trying to load WFS from geoserver. my geoserver is at localhost:8080 and webserver at localhost:80. Since there is a problem of crossdomain and my firebug showing "XMLHttpRequest cannot load ...
5
votes
4answers
3k views

Is there an easy way to create a boundary polygon shapefile from a set of LAS files using ArcGIS 10?

I have a bunch of LAS file sets that I need to process. The current task at hand is to generate a "footprint" shapefile that contains polygons for each LAS tile. I am looking for a graceful way to ...
9
votes
2answers
4k views

How accurate are measurements in Google Earth?

Can anyone point to a resource that lists the accuracy of measurements taken in Google Earth?
-3
votes
1answer
932 views

Image classification [closed]

How can I do classification based on NDVI image. What kind of process and model can do it? Thanks a lot
7
votes
1answer
946 views

Should I split MultiPolygons into Polygons?

In the system I'm implementing I have a table T1 with an associated geometry. Most of the geometries are a set of n polygons, with 10 < n < 100. At the moment in the table T1 I have a geometry ...
1
vote
1answer
576 views

ArcGIS for Windows Phone with Bing maps and shape files

I have a set of shape files that I want to display on a map along with satellite imagery. I currently use ThinkGeo for this sort of thing on Windows. I'm writing a Windows Phone app that must ...
2
votes
1answer
1k views

sharpmap overlay mapinfo on bing/google

I want to use sharpmap to overlay a mapinfo tab file onto google or bing. I have it working pretty much at the moment however the co-ordinates that bing/google show are in correct so my mapinfo file ...
9
votes
1answer
824 views

Large Scale Geocoding and Processing in ESRI

Ok, so I guess this kind of a informal query/survey about how big a datasets you are using in your ESRI worlds... I am building and maintaining a statewide dataset, where I have to process down to the ...
15
votes
4answers
756 views

Why do valid polygons repeat the same start and end point?

In the GIS world, for most modern formats and Standards (e.g., Shapefiles, WKB/WKT, GML, KML, etc.), valid polygons need to have closed linear rings, which is a linestring of coordinates where the ...
3
votes
1answer
1k views

File IMG from OSM

Is it possible to convert or open an IMG file from OSM? I don't find a solution for the visualization and conversion. Thanks
9
votes
1answer
2k views

How to create sidebar help information for Python script tools of ArcGIS Desktop?

I have been creating custom tools (Python script tools) using Python with the ArcPy module. I can set up the tool successfully with parameters and all, but I cannot figure out how to create help ...
1
vote
2answers
1k views

POI Datasets for North America

I use foursquare because it contains a lot of POIs. Which database do you use when you need a point of interest in North America?
5
votes
1answer
507 views

.NET And ArcGIS 10x - Where have all the wrappers gone?

With prior versions (to ArcGIS 10x) of ArcGIS, the .NET wrappers used to be placed in a dotnet directory. Where are they located with 10x? With prior versions, I used the absence or presence of this ...
5
votes
2answers
620 views

BBOX and Projections of WMS services in Geoserver

we have tried to overlay a raster layer on Google map and have some difficulties to align the raster images onto the base map. When it is on the overview (Zoom level 1), it looks like this: On a ...
4
votes
1answer
301 views

Facebook Place Api

Do you know if there are a requirements or restriction on Facebook Place API? Is it possible to download the data? Is it open-source?
3
votes
1answer
1k views

How do you make a SQL join query for a NULL in a search cursor in ArcPy?

I am trying to learn how to do some error catching/avoiding in ArcPy. Here is a simplified version of what I would like to do. I would like to take some points, and then check to see if there is a ...
0
votes
3answers
2k views

Copying objects to existing records in MapInfo

This should be fairly simple but I think I'm missing something... I have two tables of similar structure with corresponding data in them (i.e. same number of rows, rows have the same IDs). The main ...
0
votes
1answer
268 views

Why do Web ADF Map and MapResourceManager maintain their state in session this way?

I'm using ArcGIS Server Local datasource. ArcGIS Web ADF MapResourceManager control maintains resources added once until session is abandoned. Why does it do so? Why not just use viewstate? Map ...
7
votes
1answer
716 views

How does one calculate an angle in a geographic coordinate system?

Given three points on a line in a geographic coordinate system, how does one calculate the angle formed by these three points? Please, give a general solution but also include system specific ...
2
votes
3answers
374 views

Esri Web side and Silverlight

I am experienced on Esri gis desktop and engine development.But i want to learn about the web side.Where should i start ? There is noone to teach me where to start.Is it as difficult as desktop and ...
4
votes
2answers
275 views

How can I make my data efficient and “light” to do 3D Visualizations in Google Earth?

As a test run, I'd like to visualize population on census blocks for a few states (New England for example). I assume that the kml to do this will be huge, when you factor in the census boundaries and ...
3
votes
1answer
719 views

Convert from shapefile to GPX with selected attributes

I have a points shapefile that originally came from a GPX file (imported using QGIS). The original GPX file contained waypoints only and has disappeared. The shapefile has many attributes, but only ...
2
votes
3answers
1k views

Convert Arcgis Rest to OpenLayers Vector

i am working with openlayers and esri rest services... in my api due to esriGeometryPolygon for all city , rendering map is taking lots of time ..there for i dont take a good result.. first of all is ...
2
votes
1answer
233 views

Geocoding advice by using Arcgis

Hello everyone i have an administrative unit feature dataset (polygons) with 3 levels: Admin 1 - Province, Admin 2 - District and Admin 3 - Commune. Now i want to make a geocoding process of an ...
2
votes
4answers
527 views

Extraction of monthly image from two-16 day images

I need to conbine two-16 day NDVI image into monthly NDVI image. To do this, what kind of function and formula are used in ENVI, ARCGIS or ERDAS? Best regards,
37
votes
7answers
4k views

Best practices for PostGIS production environments?

What PostGIS documentation have you come across that has been helpful when tuning PostGIS for a production environment? I would like to get together with my DBA to setup a Postgresql/PostGIS ...
0
votes
1answer
381 views

Calculating length with Python and the PYTHON_9.3

(Please critic wholly if possible) If I have polyline data in NAD83 and I want to calculate geometry using the PYTHON_9.3 parameter from the arcgisscripting.create(9.3), I am getting mixed results. If ...
1
vote
1answer
985 views

Using C# + Mapcript + Openlayers

Nowadays i'm using Mapscript and C# to generate and display a Mapfile, but in this way i need to create manualy the interface, is there any way to use Mapscript + Openlayers?
2
votes
1answer
759 views

How to provide transform information to openlayers on Image layer

I would like to include an overlay raster layer into my OpenLayers map. I've pre-transformed the image into the correct projection (EPSG:900913) and saved as a png using the gdal_translate command: ...
3
votes
1answer
740 views

How to Solve the error - “Python Plugin is Broken”?

I tried following the steps to build a python plugin for QGIS. (step 3 is where I am stuck at) 1) I used the Plugin Builder plugin to build the initial set of files. I call my plugin ...
3
votes
2answers
231 views

How can I load .SID files in ArcEngine?

How can I load .SID files in ArcEngine? I think its possible, but I can't find any links. With Kirk's help I got it here's the code: public void add_SID_file(string dir) { ...
6
votes
1answer
720 views

Creating columns in PostGIS using osm2pgsql hstore tags

While I feel this may come down to a database question, it feels GIS-related enough that I feel comfortable posting it here. I'll be happy to take it elsewhere if it belongs there, though! I've ...
4
votes
0answers
942 views

FeatureLayer SaveEdits failing

I've created a layer which I have bound a DataFeatureForm. Everything is working hunky dory, up to the point where I try to call the layers SaveEdits method in the EditEnded event. When I call this ...
8
votes
3answers
749 views

Longitudinal Issues with NetCDF data

I am seeking advice on working with world data sets where the GCS has a positive range (0 degrees to 360 degrees). The data I am working with are NetCDF oceanographic data and have positive coordinate ...
4
votes
2answers
928 views

Comparing two featureclasses using C#

I'm sorry, I know this is a pretty simple question but am having trouble getting this to work. Basically, I have 2 linear featureclasses and they both have the same fields and spatial reference. FC1 ...
5
votes
3answers
2k views

resize image resolution from 1000 m to 250 m

I'm beginner of ARCGIS and RS. I have many problems with the procedure. One of them is I have NDVI images and Soil map. Both are at the different resolution: NDVI is 250 m. soil map is 1000 m. So I ...
10
votes
7answers
10k views

Where can I find a shapefile of city boundaries in the US?

Where can I find a shapefile that contains boundaries for the major cities in the United States? I have tried the census website but could not find anything.
8
votes
6answers
17k views

ERROR 000212: Cannot create XY event source Failed to execute (MakeXYEventLayer)?

I have a csv file that is 133mb in size and has over 1.3 million lines of data. Each line of data has its own lat/long and I was wondering what would be the best way to display those points based off ...
2
votes
1answer
1k views

How do I change a text box to a text area? (ArcGIS API for JavaScript)

I recently posted this question on the Esri forums and thought I'd give stack exchange a try too. I'd like to take this sample: ...
8
votes
2answers
678 views

Why do I need ArcGIS Server just to host ArcObjects in a web service?

I get this question a lot from web developers, and would like to have a short concise answer for them ... Why do I need ArcGIS Server just to host ArcObjects in a web service?
1
vote
1answer
300 views

How to get a composition name in Qgis python console?

In Qgis python console: I want to populate a list with compositions names, like in Composer Manager, but I can't figure out how to get the names (titles). So far: composerlist = ...
2
votes
0answers
472 views

Why can't an “AI export” from ArcGIS 10 be opened in CorelDRAW X5?

It doesn't matter whether the .ai file is 1.5GB or 5MB, whether it's complex or simple; I always get the "The file cannot be opened." critical error. I use CorelDRAW X5 not Adobe Illustrator but ...
2
votes
1answer
1k views

GeoTools Dynamic Layer

I need to change the features of a MapLayer in real-time but I don't know how I can update/refresh/repaint the layer on the map without having to remove it and add it again (which creates flickering). ...
0
votes
1answer
141 views

OL application is at different production server than GeoServer

My OL ASP.Net web application is hosted at 172.24.100.16 production server (windows server 2008)whereas Geoserver is hosted at 172.24.100.15 production server (Linux, UBUNTU). When i access page from ...
6
votes
3answers
7k views

Converting X,Y coordinates to lat/long using pyproj and Proj.4 returns the wrong coordinates

I'm writing a python script that reads multiple XML files containing x and y coordinates and combines them all into a single csv file. Latitude and Longitude are required fields in the csv, but I am ...

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