1
vote
1answer
935 views

How to remove pixel values below -1?

I have downloaded NDVI from MODIS website and pixel values go up to -3000 to 1. I want to remove all values below -1. How do I do this? I am using ENVI 4.3
28
votes
1answer
26k views

How to install a QGIS plugin when offline?

Due to various IT policies at my workplace, QGIS is installed on a machine that is not connected to the internet. I wish to install a couple of QGIS plugins on this system. I have downloaded the ...
4
votes
2answers
579 views

Unable to select Vector Layer

I am using the following example, to select a vector layer feature on click. The example demonstrates Highlighting and selecting the layer. I was able to successfully implement the Highlighting of the ...
2
votes
3answers
452 views

Finding Satellite Imagery For Use Without Internet Connection

So, I am not a GIS expert. I just write software and I've done some work with ArcMap, ArcGIS Server, and FalconView. What I need is world wide satellite imagery I can use on a local machine. Street ...
1
vote
0answers
569 views

how to get ascii grid from corine land use data?

I'm trying to get ascii grid with land use data (by one parameter - CODE_00). Afterwards I will import it into simulation tool. But I cannot figure out how to convert ascii grid from shapefile. ...
2
votes
3answers
683 views

vector tool missing when install QGIS 1.7.4 on new computer

I installed QGIS version 1.7.4 a few months ago. Under the menu Vector > Data Management Tools I have two options to make a join: 'Join Attributes' and 'Join attributes by location' (see screenshot). ...
2
votes
0answers
358 views

Question on Exporting data from 'collect values' output in ArcGIS model builder

I have a question regarding an answer to "Exporting data from 'collect values' output in ArcGIS model builder". I'm trying to do the same thing as the author to that question and I've followed the ...
4
votes
1answer
615 views

How can I set a layer visible dynamically using Flex Viewer?

I have a set of layers in operationallayers tag in my Flex Code connected to ArcGIS Server 10, and I want to make them visible dynamically in a ComboBox Change Handler. Is it possible? Thank you
3
votes
1answer
1k views

How can I add a grid (from projection MTM8) on my layers

I need to add a grid on a map I created with my own layers and GPS data. How can i do this? I know how to do it in Arcgis, but not in QGIS.
4
votes
1answer
365 views

gdalinfo gives no georeferencing information for a PostGIS raster

I have a PostGIS raster dataset which I am trying to access via GDAL. I've had various problems with making this work, so thought I'd try running the gdalinfo command to check that GDAL can actually ...
4
votes
2answers
1k views

How do I re-use a dataframe in ArcGIS 10.0 without ArcMap crashing?

I have a large map with an inset. In Arc9.3 I was able to copy that inset data frame into another mxd to use again as another inset - it is set up exactly how it is needed. Rather than re-build a new ...
2
votes
1answer
449 views

How do you calculate positional accuracy in qgis?

How to you compare two layers in QGIS to get the positional accuracy?
1
vote
0answers
160 views

How to call a PNG file with MapServer and a Google base layer? [closed]

How can I call a png file from map path including a Google map as base layer? I'm working with MapServer and I have some shapes made with Quantum GIS and ArcView. I can call those shapes in a url and ...
11
votes
3answers
1k views

Are personal geodatabases better suited for quickly querying indexed attributes than file geodatabases?

I'm preparing data for an ArcGIS Engine application that queries the data to search for an address. Sometimes we search just on the street name field, just on the house number field, or both. When ...
4
votes
2answers
470 views

Calculating space feature class will use in ArcSDE?

Is it possible to get a good estimate on how much space a feature class will take once loaded into ArcSDE from how big they are in a FGDB? I have some feature classes in a FGDB, where some are a few ...
1
vote
2answers
320 views

Add record in related table ArcPad

i have a layer form (named form_layer) containing a combobox and allows to add records into the related table, by showing a form of the related table (named form_table) When i try to add record ...
4
votes
3answers
2k views

Create Spatial Index in PostGIS on an entire Schema

I have loaded a number of shapefiles using SPIT (QGIS plugin) to my PostGIS database. These layers did not have a Spatial Index created upon loading. I am wondering if there is a way to create a ...
3
votes
1answer
654 views

PostGIS 2.0 ST_Transform with Rasters cannot find custom SRID

I'm trying to calculate an average value in a buffer around a point. Given a raster in EPSG 4326 and a similar point, this is fine, except that the values will be skewed as they are not projected in ...
5
votes
1answer
2k views

Help importing osm data into spatialite

I am trying to import OSM data into Spatialite. The data is a query from overpass called features.osm I'm using spatialite 3.0, and following examples, I have created a new database with: $ ...
4
votes
2answers
554 views

Purpose of building footprints

What are the uses (public and private industry) of building footprints? I'm trying to figure out how polygon building footprints can be used. i.e. are they used for determining tax liabilities, ...
3
votes
1answer
874 views

How to transform ETRS to EPSG?

I have data in the ETRS 89 LAEA format (SRID: 3035). But I have problems to transform it. Example data: N2736 E4541 I want to transform it to EPSG WGS84 (SRID: 4326), to check the coordinates on ...
1
vote
1answer
2k views

Select attributs of wms/wfs layers

I want to select polygons in wms/wfs layers (openlayes). I used the code of this example http://openlayers.org/dev/examples/getfeature-wfs.html . Then, when I select a polygon in my the layer, nothing ...
6
votes
1answer
425 views

Changes in synchronized replica not shown in ArcMap or ArcCatalog without refreshing

I am synchronizing a one-way replica in ArcEditor using Python. I tried adding RefreshActiveView and RefreshCatalog to the code, but I still need to refresh the synchronized database to see the ...
2
votes
3answers
1k views

Transforming Visio polygon to shapefile?

I am a complete newb at this stuff and don't know what I don't know. I may use incorrect language. Essentially, I want to convert the shapes in a Microsoft Visio diagram into a shapefile. I pretty ...
0
votes
2answers
288 views

Remote sensing: How to start with interferometry?

I need to start learning about the interferometry techniques available/used for remote sensing data (radar or optical). Which are the main applications? Which techniques are applied? Which Earth ...
3
votes
1answer
4k views

convert list of points to line or polygon

I have a list of Points in a PostGIS table. The rows can be grouped by a date something like: myTable id INT date DATE lat NUMBER lng NUMBER geom GEOMETRY(POINT) now I need a table where all ...
5
votes
3answers
12k views

Remove spatially duplicate features using ModelBuilder

I am creating a model to remove features which are duplicated within a polygon feature class. Most of the features are duplicated once, but about a quarter have up to three or four exact copies. I do ...
4
votes
1answer
559 views

Importing multiple shapefiles with tablespace and inheritance defined

In the UK we are very fortunate to have the Ordnance Survey who provide the whole of Britain in vector format. The data is provided as over 60 tiles, each of which contains something like 16 ...
9
votes
3answers
10k views

Exporting multiple featureclasses to shapefiles using ArcGIS Desktop?

I have many feature classes in a geodatabase and I need to save/export them into shapefiles. Any Ideas? Click on every single layer -> export is not a good option, due to the number of feature ...
7
votes
2answers
2k views

How to copy a group of layers between QGIS projects?

In ArcGIS I am used to being able to have a couple of MXD documents open and copy-paste groups of layers from one MXD's table of contents to another. This can save a LOT of time ensuring consistent ...
1
vote
1answer
562 views

creating geotiff in ArcGIS to publish in geoserver

How can I create a geotiff image (to publish using Geoserver)? I want to publish geo-reference image in geoserver.Then i chose image format as geotiff and create using arcGIS 9.3.It create tiff,tfw ...
2
votes
1answer
477 views

Arcgis IPolygon(System.__comObject) and ILine2 (Esri.Arcgis.LineClass) intersection

Currently i am developing a Server Object Extension. On my project i am creating a new line class with LineClass myLine = new LineClass(); and getting a polygon from client as JsonObject than ...
5
votes
2answers
462 views

Mass-update the projection in compressed GeoTIFF files

I have a huge set of compressed GeoTIFF files. Someone forgot to set the projection while creating the GeoTIFF files and I would like to add it now. If I use gdalwarp -t_srs source.tif ...
17
votes
8answers
14k views

Creating shapefile showing footprints of Rasters?

I have around 1,000 satellite images in tiff format, and I want to create a shapefile which will serve as an index to the rasters. This is something similar to a raster catalog, but I do not want to ...
6
votes
4answers
10k views

Search if field exists in feature class

I have a few dozen feature classes, one of which contains the field I am looking for. They are stored in several different file geodatabases. Is there a quick way of searching each feature class to ...
2
votes
1answer
192 views

Overlapping buffers - Doublecount points that fall within 2 or more buffers

I want to analyze crime around certain types of stores in a city. I made buffers around the stores and I need to a) select and extract crimes that occurred within those buffers, and b) join the two ...
1
vote
1answer
362 views

What are AGF Files, how do we put them in PostGIS?

I came across term which says AGF, after Googling I found its Autodesk Geo Files, But some other say, Atlas Geo Files, Which one of them is right. I also came to know that It is an extension to WKT ...
2
votes
3answers
7k views

Python script: Access data from databases [closed]

I need to access data that is inside an oracle database using a python script. Its a Unix server running oracle 10g. I dont have much access to the database server. It works fine on model builder ...
3
votes
1answer
101 views

set wrong GPS unit in “degree” and want to change to “meter” in GIS while editing

I want to edit the GPS result in ArcGIS, but I found that there is a problem. I set the wrong unit while I used the GPS outside , and the unit is "degree". Although the coordinate system is correct, I ...
3
votes
4answers
9k views

csv to kml converter

Does anyone know a workable and stable program which converts csv extension files to kml? There are many tools available online but none of them worked for me. I tried many including kmlcsv ...
1
vote
0answers
493 views

Cannot join feature layer with SQL Server table with query built in it in ArcMap

I need to join a feature layer with a SQL Server View with a common field in ArcMap. The View was successfully added to ArcMap as data table with some query built on it from Query Builder. When I ...
2
votes
3answers
2k views

ArcGIS REST server projection with OpenLayers

I'm adding an ArcGIS tile server to my openlayers tile server options via this javascript API. I have it displaying the map correctly, but it seems stretched out horizontally (I have a feeling the ...
4
votes
1answer
877 views

Authentication in geoserver with openlayers

Is there a way to authenticate in geoserver with a external webpage (made with asp.net and openlayers)? I have restricted the access data only by certain users, and I don't want to authenticate this ...
2
votes
2answers
2k views

display a selected WMS Info

I am using the WMSGetFeatureInfo and I am also obtaining the Info of the base raster and i do not need that. Is it possible to obtain the FeatureInfo of only selected WMS features? How can I modify ...
1
vote
2answers
589 views

TF.Net versus the NetTopologySuite

In a recent post, a responder made reference to the Topology Framework .Net. I'd never heard of it before, having gently used the NetTopolgySuite (and DotSpatial) before with satisfactory results. ...
9
votes
1answer
381 views

Reprojection - Learning the ins and outs

I would like to expand my knowledge coordinate systems, projections and reprojecting data, with a view of writing a reprojection engine. Could you provide me with some resources (books, websites, ...
2
votes
1answer
1k views

Batch intersect from a text file using Python (ArcGIS)

I am attempting to modify my code below which reads from a text file of shapefiles and executes an intersect and outputs them to a user specified location: import arcpy, sys, os from arcpy import env ...
2
votes
0answers
306 views

Flex Geoprocessing Widget output parameter invalid

I want to publish a ArcToolbox with a script on a Flex application as a widget. I have ArcGIS server from which I will publish it as a geoprocessing service. The tool has an input parameter which is a ...
3
votes
2answers
2k views

How to find a point on given line that its distance from another point is given also?

I have this input: (lat1,lon1), (lat2,lon2) - Two coordinates that create the line (lat0, lat0) - Point on this line d - distance I want to find a point (lat, lon), where (lat, lon) is on the ...
3
votes
1answer
1k views

Export SRTM30 Dem file as 3d

i have downloaded some SRTM Dem files here: http://dds.cr.usgs.gov/srtm/version2_1/SRTM30//srtm30 They are from the USGS site. I would like to export them as 3d. I have ran through a few ...

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