Tagged Questions

2
votes
1answer
73 views

What is No Data Value?

I'm looking at the transparency window of the layer properties of my "Heat map". How does the No Data Value effect a raster layer. I'm assuming an initial setting of -9999 sets it out of the way, so ...
4
votes
3answers
66 views

Where can I find decadal climate and ocean data for Europe?

I would like to find decadal climate and ocean data for Europe that I can download and use directly in ArcGIS. Specifically, I am looking for mean annual temperature, sea surface temperature, and ...
2
votes
1answer
150 views

Question about sizes of input rasters for raster calculation

To calculate any formula (conditional statements/relational operation etc) in the raster calculator in ArcGIS using two different sources of raster images, I'd like to know input rasters must be the ...
4
votes
3answers
139 views

climatic data from MODIS or other sources

I'm looking for climatic information in the form of raster like MODIS daily LST (Land Surface Temperature) data. I'm looking for other parameters like precipitation, humidity, air pressure and so on. ...
2
votes
1answer
83 views

Is there anywhere that I can obtain global UV data in either raster or vector format?

I'm looking for some UV data (currently with no spatial or temporal resolutions in mind, but ideally split into UV-A and UV-B) for the whole earth. Can anyone recommend a source for data like this or ...
3
votes
2answers
54 views

Where to look for oceanographical/environmental data for the Arctic (Baffin Bay/Davis Strait area)

I am looking for oceanographical/environmental variables that are available for Baffin Bay/Davis Strait area over the time period of 1995-2011, however, I am not familiar with ...
0
votes
0answers
60 views

How to view raster data? [closed]

I am trying to view data from an ArcGis map that is saved as a bunch of ADF files. I have never used ArcGis or Quantum GIS before, but I do have them installed. The data is available here: ...
3
votes
1answer
228 views

Looking for Mid-Holocene (~6000 BP) bioclim dataset

I am trying to obtain climate data for the Mid-Holocene (~6000 BP), preferably in the bioclim (19 bioclimatic variables) raster format. The worldclim.org website lists this dataset based on the CCSM ...
2
votes
1answer
801 views

Why is ArcGIS crashing when I try to load .adf raster data?

I am pretty new to GIS, so forgive me if this is a stupid question. I downloaded a bunch of land cover files from USGS seamless warehouse of Florida. Every time I try to 1) view the .adf file (which ...
1
vote
0answers
96 views

How to delete classes that cover only a small area? [duplicate]

I want to delete pixels that have a small area of classifying in raster and vector images in ArcGis software.
0
votes
1answer
124 views

Where to get raster files of Earth, united states [duplicate]

Possible Duplicate: Open access repository of general GIS spatial data? I'm brand new to GIS programming so please excuse my lack of knowledge. I am developing a GIS web app using ...
3
votes
5answers
854 views

When a raster is clipped to a polygon with Python, why does it still take on the extent of the entire shapefile?

I am clipping a raster image to each polygon row in a shapefile in ArcMap 9.3 using the Clip tool (Data Management) in Python with Clipping Geometry set. While the clipped raster successfully depicts ...
3
votes
2answers
722 views

Fastest way to create an ESRI Grid and populate cell values?

In terms of processing speed what's the fastest way of creating and then adding values to a raster? The values will originally come from ASCII files which can be about 500MB in size - ideally I ...
4
votes
3answers
434 views

Australian Topo Map GeoTIFFs

Does anyone know if Australian topo map GeoTIFFs are made available anywhere (preferably for free)? LINZ makes them available in New Zealand - http://www.linz.govt.nz/topography/topo-maps/index.aspx ...