Tagged Questions

1
vote
1answer
55 views

How to create a Winkel-Tripel map of countries with different colors?

I need a good quality rasterized world map, Winkel-Tripel projection, in which all countries have different (random?) colors. No borders, text, grid or anything else on the map. Is GIS the right way ...
1
vote
1answer
30 views

QGIS Field Calculation convert to ArcGIS

I have a field calculator expression I use in QGIS to generate unique IDs that are sequential, but start with a text string. I now need to perform the same thing in ArcGIS, but I am unsure of how to ...
-2
votes
0answers
42 views

How to create a polylines from latitude, longitude values?

I have consecutive poles coordinates in kml, now I want to join as a Polyline. Please give me the possible ways in Google Earth/any gis software!
2
votes
1answer
31 views

How to symbolize different information that's joined to a single plot in a shapefile

I am a student doing an industrial survey in Windhoek, Namibia. We mapped different businesses and later did spatial analysis. Questionnaires were handed to different businesses and then that ...
0
votes
0answers
63 views

Topographic Wetness Index

Is there any option to SAGA to calculate the Topographic Wetness Index ? I have a big area and I tried many times with SAGA, the last time I thought the results was ok (before SAGA would crash or give ...
1
vote
1answer
64 views

How do I change the delimiter in the attribute table

I have imported a .kml file into QGIS, and the data is all shoved together into a single field like this: Fine, it's pipe delimited - easy to change the delimiter like in LibreOffice calc imports I ...
0
votes
0answers
53 views

Shapefiles with EPSG 31467 and 3044 don't fit together [closed]

I have a problem with some shapefiles I want to fit in my exisiting project. My project layers use as CRS EPSG 3044. They do fit together with OpenLayers GE (EPSG 3857). Now I wanted to add some new ...
1
vote
1answer
36 views

Modify CRS to match boundaries of shapefile

I have boundary data in WGS 84 and data in a custom generated CRS. The data in the generated CRS appears to be offset by a particular vector. I want to attempt to match the generated CRS projection ...
0
votes
3answers
143 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 ...
0
votes
2answers
80 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
92 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 ...
0
votes
1answer
79 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 ...
16
votes
0answers
304 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
2answers
133 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
75 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
79 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.
1
vote
0answers
43 views

Select polygons by cutting sequence with guide and sequence-dependent number

40,000 polygons with randomly distributed ID's are to be numbered in ascending order in a field of a table. The order of the numbering is defined by the direction of the guide. Is there a solution? ...
3
votes
1answer
85 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 ...
2
votes
0answers
35 views

Is there a tool for automated quality assurance for vector data captured on raster data?

I wonder whether is any tool(or script) in ArcGIS or QGIS which allows to make an automated quality assurance for vector data captured on raster data? vector data on binary raster:
5
votes
1answer
105 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 ...
2
votes
0answers
64 views

oil palm stand census algorithm

Anyone have experience in oil palm stand census using tree detection algorithm from satellite images in ArcGIS or QGIS? any references for usable algorithm? What is the accuracy? thanks for help.
2
votes
0answers
53 views

Looking for similar tool (like ArcGIS Diagrammer) in open source for QGIS?

Is there any diagrammer tool available (similar to ArcGIS Diagrammer) for QGIS? thanks in advance : )
6
votes
2answers
134 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 ...
3
votes
1answer
84 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
170 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
241 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
266 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
149 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
188 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 ...
4
votes
4answers
192 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
238 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
498 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 ...
2
votes
0answers
293 views

Converting ArcGIS .mxd to QGIS .qgs without having ArcGIS installed

I was reading this link question How to convert an .mxd file to a .qgs file?. It looks as though this only works with ArcGIS 10? And the conversion needs to be done in ArcGIS 10. Does that seem right? ...
4
votes
3answers
119 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
144 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, ...
5
votes
2answers
196 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
1answer
147 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
87 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
138 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 ...
2
votes
0answers
93 views

How can I map polygon value distribution?

I'm surveying an area and have a z-value attached to each polygon. In comparison to the area I'm studying the polygons are quite small. What I'm trying to do is show the distribution of this value. ...
5
votes
1answer
161 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
185 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
159 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
128 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
127 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
82 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
287 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, ...
1
vote
1answer
139 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
111 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 ...
4
votes
0answers
259 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 ...

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