The observed biophysical cover of the earth's surface. Data are essential elements in a wide array of government and private sector activities, including inventory, management, monitoring, and modeling.

learn more… | top users | synonyms

2
votes
0answers
30 views

filling the attributes according to intersection of two layers (Postgresql)

How to automatically fill attributes of a point layer according to the exact position in the polygon layer? I mean how to write a command in PostgreSQL to automatically fill the attributes by the ...
4
votes
0answers
43 views

Creating forest patches from land cover layer?

I have a land cover layer from which I've extracted the tree canopy class and set all values that are not tree to NULL. I've also converted it to a vector and exploded it to make single part features. ...
2
votes
1answer
58 views

Reclassify on land cover raster won't work

I'm new to GIS so I apologize if this question is basic but I couldn't find my answer online. I'm trying to reclassify a land cover raster from the National Land Cover Database. I want to reclassify ...
4
votes
3answers
101 views

Extracting tree crown areas from remote sensing data (visual images and LiDAR)

I am looking for a method to process a remote sensing image and extract the crown areas of the individual trees from the image. I have both visual wavelength areal imagery, and lidar data from the ...
1
vote
0answers
37 views

Comparing unclassified super-objects with classified sub-objects

I have two shapefiles exported from ecognition. the first shapefile contains the land cover classification and the 2nd one contains unclassified superobjects of the 1st shapefile. I want to compute ...
0
votes
0answers
28 views

Total area of ArcGIS Intersect output is NOT equal to the smaller input?

I have two polygon inputs that share the same projected coordinate system - one is land cover data, the second is parcel data (of smaller total area). When I execute a standard geoprocessing ...
1
vote
3answers
144 views

Equivalent of CORINE land cover data sets for rest of world

I am looking for the equivalent of CORINE land cover data sets (100 meters) for the rest of the world; not merely urban areas but any area in general. I see sousa's question unanswered so I thought I ...
1
vote
1answer
40 views

Extraction of pixels from layerstacked NDVI image

How do I get rice pixels only from layerstack NDVI (modis) or SASI image? I also have a thematic rice image Please tell me how to do in erdas.
3
votes
0answers
53 views

How to use WEKA J48 classifier for satellite image classifications

Basically I am trying to build a tool from WEKA software using the J48 classifier for automatic satellite image classification to build landuse land cover maps. Could somebody please help, as I am not ...
1
vote
1answer
67 views

How to calculate raster data in vector area?

I have two layers. One is a layer of USA ecoregions (there are 9 ecoregions). It is not raster (so it's vector?). The other layer is the National Land Use Data set (so I know where there's ...
1
vote
1answer
77 views

Mapinfo Conversion Plugins

I have created a land classification using QGIS in Geotiff format and need to convert this to Mapinfo format. I tried to used the conversion tool file type (Northwood Classified Grid Format .grc ...
1
vote
1answer
48 views

Easy Guide to ESA satellite data?

Can anybody provide user friendly guidance to ESA datasets? What is available? When will new stuff be available? I struggle to work out what might be interesting amongst the many websites and their ...
1
vote
0answers
31 views

Maxent output clips to minimum extent of all input variables

I am experiencing an issue with the spatial extent of my output ASC files. I am using the UK Land Cover Map (LCM) 2007 at 25 metres resolution as a categorical variable in my Maxent modelling, ...
2
votes
1answer
57 views

Where can I find official Land Use/Land Cover GIS data for Ecuador?

Right now I'm specifically looking for Land Use/Land Cover data but things like roads and soils would be handy in the future as well. In the U.S. my source for nationwide LULC data would be the ...
1
vote
2answers
59 views

How to add polygon layer into raster data?

I performed a supervised land-use classification with Erdas. Landsat data was used in ArcGIS to Digitize urban areas as polygon shapefile. I want to insert these polygons into the land-use raster ...
0
votes
2answers
198 views

How to create several header files to open AVHRR NDVI3g (GIMMS) files?

I have downloaded GIMMS NDVI3g data from http://ecocast.arc.nasa.gov/data/pub/gimms/3g/ I now need to open the files in arcgis. I have the follwing GRID PARAMETERS: grid-name: Geographic Lat/Lon ...
0
votes
0answers
33 views

Extract individual land cover classes from NLCD dataset in ENVI

I have a National Land Cover Dataset with 16 different classes. Is there a way to extract the pixels from each individual class and save it as a GeoTiff using ENVI (either Classic or 5.0) so that in ...
0
votes
0answers
39 views

global pseudo true color landsat mosaic available for download?

Is there a global pseudo true color Landsat mosaic available for download at no charge? Something that was derived from the GeoCover 2000 data set? It doesn't have to be 15 m, 30 m would work, 60 m ...
1
vote
1answer
99 views

Habitat fragmentation tool error

I am trying to calculate the habitat fragmentation of a forested region in Africa in order to protect the areas less fragmented. I have used the tool "Landscape Fragmentation Tool V2 requiring Spatial ...
1
vote
0answers
57 views

Distinguish between the types of cultivated crops in remote sensing

I recently produced map of LULC but there is the difficulty of distinguishing between the types of crops. Is there a method to distinguish between the types of cultivated crops such as wheat, barley, ...
0
votes
1answer
126 views

Postgis array query

I have a Postgis database with land cover vector data with the following layout: select * from CLCtable limit 0; outputs: gid | code_06 | id | remark | area_ha | shape_leng | shape_area | the_geom ...
0
votes
0answers
53 views

High resolution global land cover [duplicate]

I'm searching for world land cover data with higher resolution than the global land cover. I'm working on fire prediction algorithms and I want to do a nice browser based demo were you can select a ...
1
vote
2answers
129 views

World Land Cover data

I need to get land cover data for the entire world. I'm using corine land cover data for Europe: http://www.eea.europa.eu/data-and-maps/data/clc-2006-vector-data-version-2 but I have no idea how to ...
0
votes
1answer
73 views

What tool breaks up raster cells into individual values based upon contiguity?

The green values have a COUNT attribute of 13418. I will want to use a tool that lumps the COUNT attribute and reclassifies based on values. But first it appears I will need to break up the raster ...
1
vote
1answer
84 views

How to select a part of a land cover type a certain amount of feet away from another land cover type

I have raster Landcover type Urban combined with Forest all within the county raster perimeter. I want to make a layer of only the forest cells that are more than 500 feet from an urban cell, so that ...
3
votes
2answers
102 views

Is there a database/service that allows me to get the terrain type to a coordinate?

I hope i'm not totally wrong with this kind of question at this stackexchange page. Is there any sort of service avaiable that gives me (or allows me somehow to generate) the areatype to a coordinate? ...
1
vote
1answer
89 views

Satellite imagery options for small/medium sized countries?

I need to create land cover classifications for a couple countries in central/eastern Asia. The largest country is 50,000km^2 and the smallest is 10,000km^2. What are my options for recent imagery? At ...
0
votes
1answer
369 views

Issues calculating NDVI from ASTER

I'm having an issue with ASTER data. I have two mosaics; one for 2008 and one for 2012. Both are composed of 4 ASTER scenes and the scenes are all from the same two month period (i.e. no seasonal ...
5
votes
1answer
480 views

Geo and Population Coverage Calculation

We are calculating Population and geocoverage in mapinfo. We have calculated population coverage as an area overlap. How do we calculate population coverage if we have population defined for each ...
2
votes
1answer
195 views

How to work out sqft/m of land coverage?

I am currently self teaching myself on qgis whilst volenteering on a project on a river catchment and your help is hugely appreciated! I need to be able to work out the percentage of land cover or ...
5
votes
2answers
226 views

Is there a way to increase the search radius of nearest neighbors for the Nibble tool?

I am working with a raster map vegetation types. I have about 20 types with unique raster code values that can be sorted into three classes: 1 - vegetation types I want to expand using the nibble ...
0
votes
0answers
100 views

Land Cover vector data for Saskatchewan / Manitoba Canada

Looking for Land Cover (aka Land Use) vector data for Saskatchewan / Manitoba Canada. Using Saskatchewan's site I can see the data but not download it as seen here: Another source is Data Basin but ...
1
vote
0answers
42 views

How do I use the SPOT land cover data?

This is a follow-up to my previous question: Where can I find recent rainforest (change) land cover data? I have succeeded in finding data that more or less meet my needs but I cannot interpret ...
2
votes
1answer
142 views

Where can I find recent rainforest (change) land cover data?

I want to try to get a handle on what's becoming of the world's rainforests right now but not seeming to find recent (i.e. around 2010) data. The stuff here: http://www.glcf.umd.edu/data/ as far as ...
3
votes
2answers
74 views

Works (publicly available) combining LUCAS with other European land data bases?

EUROSTAT provides the LUCAS dataset, a multi-purpose survey on the state and the dynamics of changes in land use and cover in the European Union. I wonder if there are any land classification ...
2
votes
1answer
130 views

What are the geometric principles and GIS techniques that I can use to generate a postcode coverage of my city at street scales?

Postal codes of Brazil and another countries are oriented to distribution logistics, and improvement of reliability in writing the postal addresses; but without much concern for the spatial ...
3
votes
3answers
741 views

Where to get Land Use data for the UK?

We're currently looking for a Land Use dataset for part of England (UK) and were wondering what datasets are out there, either free or commercial. One's we've found so far: ...
7
votes
2answers
311 views

How to remove long linear strips from polygons?

I have a polygon layer representing impervious land cover. This was taken from a land cover raster dataset. The impervious data represents all impervious surface that is not buildings or roads. I ...
3
votes
2answers
4k views

How do you use GIS to detect percentage of Land Use Change

I am a student in GIS I have a dissertation about land use change. I have questions about using ArcMap 10 for this aim, how can using GIS to detect the percentage of land use change. For example we ...
1
vote
0answers
117 views

Raster display for topographic map

I'm trying to see how good a custom topographic map could be using only free data For the moment I'm just playing with the data so of course the colours are not pretty. I did some classification and ...
5
votes
5answers
1k views

How to generalize and vectorize a LandUseClassification raster file?

I want to vectorize that rasterfile with its 6 landuse classes. The classification is very noisy and have to be generalized before. The result should be a polygone vector file. I use SAGA, (GRASS) ...
3
votes
1answer
163 views

CORINE LandCover: what about the accuracy?

How accurate is CLC? Do anyone know any scientific papers about that question? I tested the new CLC2006 for a region in turkey and its totally rubbish!
3
votes
0answers
73 views

Percent cover based equation for horizontal ground visibility?

I'm trying to put together a layer representing horizontal visibility at ground level. I'm thinking of using the EVC (vegetation cover) layer from the landfire project (see ...
4
votes
3answers
632 views

Remote sensing: How to define landuse from remote sensing data?

I am trying to research ways into obtaining landuse data for a project which calculates the visual impacts of wind parks. I have a DEM and DOPs for a relatively large region (5000km²), but I have no ...
2
votes
5answers
433 views

Land Use/ Land Cover for Hawaii

Talking to a friend of mine in Hawaii and I am from New Mexico. My question to you all is to see if there is a land use/land cover dataset for Hawaii. Thanks.
5
votes
1answer
93 views

What kind of high level semantic free GIS layers out there?

I'm looking for free GIS data that contains some high level information such as type of vegetation or type of soil or some other visual characteristics of the neighborhoods. I need more information ...
5
votes
3answers
1k views

Why doesn't the split tool return any records in the attribute table?

I've been trying to split a large land use shapefile using a set of study area polygons as the split feature, but when the function finally finishes running (the land use dataset is quite large), all ...
10
votes
3answers
3k views

Land Cover Feature Extraction from Satellite Imagery

I'm interested in a low-cost or open source solution for creating land cover GIS layers that utilize both spectral and textural extraction algorithms. I have used PCI Geomatica, ENVI, and Feature ...