1
vote
0answers
26 views

Cannot Save Edits to File Geodatabase Replica in QGIS 2.2

When trying to edit a File Geodatabase Replica in QGIS 2.2, everything works as expected until the user saves their edits. When pressing save, all edits revert back to their original state with no ...
0
votes
0answers
51 views

How do people celebrate GIS Day? [duplicate]

Was looking to hear about interesting or creative ways people are celebrating GIS day. http://www.gisday.com/ There is a map of where some event are happening, but the infowindows are not ...
1
vote
1answer
115 views

Modify CRS to match boundaries of shapefile

I have boundary data in WGS'84 lat/long and data in a custom generated CRS. The data in the generated CRS appears to be offset by a particular vector compared to WGS'84. I want to attempt to match the ...
0
votes
3answers
470 views

How to rasterize a vector map?

I am looking for a way to create a raster grid from a vector map. I have a map consisting of shapefiles which I want to export as a raster with UTM coordinates. I was thinking of something using the ...
1
vote
2answers
525 views

Mysterious Problems with .IGE file

I'm trying to manipulate an .IGE file, which I understand is a raster data format developed by Erdas Imagine. The data I've downloaded is the National Land Cover Database (NLCD) 2006 Percent Developed ...
1
vote
1answer
170 views

Convert Heatmap into a Grid of Points

Question: How do you take a heatmap generated using a GIS software (arcgis, qgis...) and convert it into a uniform grid array of points which can be used to regenerate the heatmap (although with ...
1
vote
1answer
303 views

Changing symbology/color in kml when exported from arcGIS/QGIS [closed]

I have marked some points and used symbology in ArcGIS/QGIS... when I export the file to kml, the color/symbology changes and only single color/symbol remains. Is there any possible way that the ...
21
votes
1answer
630 views

What does the adoption of Python by NVIDIA for GPGPU mean for GIS?

Today NVIDIA announced support for the Python language on its flavor of GPGPU (CUDA). Manifold GIS uses CUDA to enable some accelerated raster operations but it is not a programmable environment and ...
2
votes
3answers
317 views

CRS in QGIS and ARC don't line up (Malaysia RSO Projection)

I am using QGIS 1.9.0 on Linux Mint; and I am new to (Q)GIS I have three layers (2xshapefiles, 1xopenlayer[Bing Maps]) that I am trying to line up located in peninsular Malaysia. Shapefile_1 is a ...
1
vote
1answer
241 views

How to do spatial adjustment of Line features by edge snapping in ArcGIS?

I have two polyline features of same area which are prepared based on two different raster imagery. Hence the two features are not exactly matched and has some shift. How can I adjust them to overlay ...
1
vote
2answers
307 views

How can i make a polygon of cells of a raster

I have 100 rasters, each raster has the same cell size and extent and i want to make a polygon over of each cell. Can anyone help me doing this? Thanks in advance.
3
votes
1answer
237 views

How to make survey lines within a polygon?

I am trying to figure out how to make survey lines within a polygon. So first I make a polygon. Now I need to fill this polygon with lines, where I can choose the spacing between the lines, and the ...
5
votes
1answer
138 views

What projection is this and how to use it in a GIS?

I have a request to do a map in non-standard projection: (source: http://www4.agr.gc.ca/AAFC-AAC/display-afficher.do?id=1263246127905&lang=eng) I couldn't manage to find it my materials. As well ...
6
votes
2answers
474 views

How to implement multivariate hex bins?

I have two point datasets that I am analyzing and I wanted to implement a multivariate hexbin approach for displaying this data. I have managed to cobble together an approach using QGIS SVG symbols ...
4
votes
1answer
116 views

Automatically build branches of a river network?

A small non-profit, specializing in fish habitat restoration, has asked me to link a spreadsheet of field notes to their gis. What we have is: 1) A spreadsheet of field notes for small fish streams. ...
8
votes
2answers
340 views

How to link dataframes in ArcGIS or QGIS?

The below image shows a layout in ArcGIS 10.1 with four dataframes. Each dataframe is of the same geographic area, although they are different images. For example, the top left image is a 1989 DOQ, ...
2
votes
2answers
412 views

shapefiles in QGIS and ArcGis

Hi I'm working with a set of shapefiles and have some problems with the "align" of them in QGis when I load Openlayeres to reference some points. OLs has an straight horizontal baseline but the ...
1
vote
3answers
420 views

How to create one KML per polygon (from one Shapefile)?

I have a shapefile containing hundreds of polygons. I need to create a kml of each of the polygon. Is there any way that I may not have to deal each polygon individually and my polygon file may give ...
3
votes
3answers
304 views

How do I sort polygons by their latitude?

We have a set of polygons which we would like to sort and number according to their latitude. This will make it easier for local authorities to relate to the numbers of the objects. I have looked ...
3
votes
1answer
294 views

color gradient (or color ramp) in Arcgis and Qgis

I am currently working on my thesis and I would like to ask you: does anybody know the mathematical formula that calculates the color gradient in Arcgis and Qgis? In other words, which mathematical ...
5
votes
4answers
882 views

How to find dead-ends in a road network

I'm trying to remove all the dead-end roads in a road dataset (lines) that are less than 100m long. How do I identify roads that are dead-ends (no exit)? The 100m part is easy. I know how to use Arc ...
2
votes
3answers
888 views

Spatial join including attributes - kind of like right join

I've run in to a little problem. I have two sets of polygons with important attributes. I need to join over the attributes from the first set to the other, but I can't seem to figure out how. ...
3
votes
1answer
2k views

ArcGIS 10 - Raster cell values and raster attribute tables - reassign raster cell values from another attribute

It seems like this should be relatively easy to accomplish, but I've been messing with this issue off and on for a couple days and have not successfully figured it out. Problem: I have a large (size ...
4
votes
3answers
237 views

Time-aware layers WCS Service

I am currently developing an application that requires to display raster images over a period of time (I'm looking how Hurrican Sandy progressed). While investigating, people have suggested that I ...
3
votes
2answers
274 views

Print Map as Tiles in QGIS or using any software.?

i need to print a detailed map, on a street level zoom of Metro Manila. i figured to do this i need to download map tiles, but that will be a breach on map usage in OSM. then i found this website, ...
6
votes
2answers
307 views

How to generate discrete areas from multiple, overlapping features?

I have a point dataset that I want to append some information from a polygon to. My polygon shapefile contains over 500 features. Whilst each of these features represents individual areas they are ...
3
votes
2answers
300 views

Data security for GIS Data (Esri shape files,Auto-cad files)

This is regarding security for GIS Data (in Esri & open source) (Esri shape files,Auto-cad files etc.) Does anyone know how to assign a password to or encrypt shapefiles OR CAD Data? I have ...
2
votes
1answer
137 views

Is there a difference between ESRI's NAD83 Indiana SPW and QGIS's?

It seems ESRI and QGIS don't have the same definition for my most commonly used projection, NAD83 StatePlane Indiana West (US ft). When I create data in an ESRI product the projection shows up in ...
2
votes
2answers
427 views

Georeference information stored in tfwx (from ArcGIS). Is it possible to see the georeference in QGIS?

I have georeferenced some images (ArcGIS -> Update Georeferencing) which creates a *.tfwx file with the new parameters for georeferencing. I renamed it to *.tfw but QGIS is not able to read the ...
5
votes
1answer
304 views

Stats on individual grid points nearest neighbours

First, thank you for this extremely useful and easy-to-access forum! I have shp of points where each point is the centroid of the individual cells of a 1*1km grid (~ 500 000 points). For each of ...
1
vote
1answer
1k views

Build Polygons from Polylines

I have to build the polygons from some polylines it is an area like a main land(with some boundaries) and some islands around it,islands are building polygons and main land is missing,when i have ...
2
votes
2answers
241 views

projection issues from ArcGIS to Qgis

I am pretty new to ArcGIS and Qgis. I have loaded some geometry data in Qgis from my postgres database, then I have also loaded the same data in ArcGIS. Then from ArcGIS i have created a shapefile ...
6
votes
0answers
145 views

KML (KMZ) to layer including all attributes [duplicate]

Possible Duplicate: How to convert KML to shapefile without losing attributes? This question is here in many variations but though I went through it I still don't have any good solution how ...
5
votes
3answers
234 views

What's the centerline of a peninsula?

Given a peninsula stretching north south and the two coast lines connecting in the south, I want to find out which is the place, or rather line, which is furthest away from both coastlines on the ...
0
votes
1answer
100 views

Projection Transformations [duplicate]

Possible Duplicate: How can I measure area from geographic coordinates? I created my spatial tables in WGS-84 with SRID:4326, I want to transform them to UTM Projection to measure length ...
5
votes
1answer
538 views

Can QGIS handle .adf attribute data?

I have been using QGIS for about 4 months now and its been great to learn a new package. I have been trying to open a source raster (*.adf) files in QGIS. I can display the raster set itself, ...
2
votes
1answer
265 views

Tools to flatten the jp2 to a single band (average the bands)?

I have created thousands of png tiles using arcgis and have merged groups of them into large jp2 files for serving via geoserver. I need to flatten these to a single band so that I can apply a colour ...
1
vote
1answer
134 views

Taking a 'custom' map and transforming its x/y co-ordinates to 'real' long/lat co-ordinates?

I was wondering if someone could help me out with a little project I'm working on. I'll try to describe what I'm trying to achieve - if it doesn't make sense, please let me know. I have in front of ...
5
votes
0answers
311 views

Can Quantum GIS replace Proprietary GIS? [closed]

I’m an MSc GIS student in the final year of my studies. I’m researching for my dissertation project which is entitled ‘Can Quantum GIS replace Proprietary GIS in large organisations?’ I’m primarily ...
11
votes
2answers
6k views

QGIS vs ArcGIS (features)

I am learning to use QGIS and ArcGIS but I can not find the differences between them. What are the differences between the capabilities of QGIS and ArcGIS?
-3
votes
1answer
325 views

Looking for a user-friendliness & functionality comparison for ArcGIS and QGIS

what is a user-friendly (ease of use) and functionality comparison for ArcGIS and QGIS? derived from Which topics are fundamental for ArcGIS? QGIS and gvSIG comparison
2
votes
2answers
488 views

Different NoData values when processing a GeoTIFF in QGIS and bringing it to ArcGIS

I'm trying to process a GeoTIFF in QGIS 1.8 using SEXTANTE and GRASS via the r.neighbors tool. I'd like to process the image, then be able to utlize it in ArcGIS. The problem I'm running into is ...
10
votes
1answer
264 views

Open-source software for managing terabytes of different formats of geospatial data?

I have a problem that I am sure many GIS Teams or Departments have which is how to find, keep track of and manage multiple different datasets from multiple sources. I have read the responses from a ...
4
votes
2answers
785 views

Create custom projection using either QGIS (or ArcGIS)?

I have searched for an answer to this but don't see anything relating to what I am trying to do. What I have are a series of Geographic Coordinates, Latitude, Longitude, Ellipsoid heights. What I ...
6
votes
2answers
340 views

How to simply label raster cells?

I think the title says everything but: I want to generate a small sample raster (eg. euclidean distance or cost distance) to explain the method of cost-distance analysis, and I'd like to label the ...
13
votes
2answers
476 views

What should a QGIS course for advanced ArcGIS users cover?

I will build a 16 hour (2 day) course on QGIS for ArcGIS users. The target users that breathe and sleep ArcGIS. As we're trying to reduce our costs, we're thinking of switching some people to QGIS and ...
3
votes
2answers
1k views

Extract WMS Data

I am trying to extract geological information from the onegeology portal unfortunaley most of the data there only consists of WMS data. For example, is it feasible to extract a particular legend ...
5
votes
3answers
787 views

How to produce a singlepart featureclass with unique IDs for each spatially non-connected polygon?

What is the best method to convert a singlepart shapefile (i.e. one record that contains several non-connected polygons) into a mutlipart shapefile? --EDIT For clarification the original question ...
1
vote
1answer
1k views

How to export Symbology from ArcGIS to Microstation or QGIS?

I am using ArcGIS 10.1 and trying to figure out how to export my symbols of elements in ArcGIS to CAD or QGis readable format. Problem is, that I can only export symbology to Style, or export map to ...
4
votes
2answers
459 views

How to find isolated geometry/attributes in road network?

I have a road network with paved/unpaved status in attribute table. This road network don't must contain isolated paved geometry. There are any solutions find isolated geometry in GIS software ...