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Arctic DEM Help!

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#1
Greg

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I'm a second year Geomatics student at Fleming college.

I am developing a educational wall map (24" x 36") of the Arctic circle, displaying a GIS of the arctic ice trends over the past 35 years. There will be surround information (graphs and information on climate change), but my main issue is obtaining a DEM for the land masses surrounding the Arctic. The DEM will only be used to visually enhance the map (no spatial or elevation queries).

I did manage to find an index of global DEM data at the USGS, (through http://terrainmap.com/) but it is missing major chunks of information (it's completely missing Alaska), and has a lot of spikes in the data rendering it nearly useless.

Does anyone know where I could obtain cleaner elevation data?

I've attached a VERY preliminary image of the map's layout to show the approximate extents of the land.
Ive also attached a screen capture of what I am striving for, graphically, in a DEM.

Any words of advice would be much appreciated!!

Oh, I should mention that I'm using ArcGIS, Illustrator with Map Publisher and have been playing around with MicroDEM

Posted Image
Posted Image

#2
François Goulet

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How about SRTM?

#3
François Goulet

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a lot of Arctic data there too... http://www.arcus.org...a_metadata.html

I didn't check specifically do DEMs though...

#4
frax

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I would use ETOPO5 or CleanTopo2 for this - you don't need that much detail in the topography. I am working for the UN Environment Programme Polar center - UNEP/GRID-Arendal, with maps and GIS, so I should know... I have done a bunch of these, including more detailed maps.
http://polar.grida.no
http://maps.grida.no/region/geoarctic
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#5
rudy

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How about SRTM?

Isn't SRTM limited to below 60N and above 60S?

#6
François Goulet

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Isn't SRTM limited to below 60N and above 60S?


I don't like it! :( Now I have a doubt! Where the h*** did I take my elevation data?? I know it was in the public domain and it was 30 months ago...

It has to be GTOPO30?

but mine has bathymetry as well so maybe SRTM30 Plus?

#7
Greg

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I would use ETOPO5 or CleanTopo2 for this


Wow Frax, thank you so much for this.
I have just begun to search through this data, but it is looking perfect for my application!

If anyone is interested, I will post up the updates in a week or so, hopefully get some helpful critisism.

Thanks again
Greg Moore

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#8
Greg

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I'm having some issues projecting the raster data from CleanTOPO2 and Natural Earth II with Map Publisher.
ArcGIS doesn't seem to even recognize the raster for Natural Earth II. Should I be using other software?
Greg Moore

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#9
François Goulet

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In the Globe section of Natural Earth II' you have a polar projection...

It could be helpful

#10
Greg

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In the Globe section of Natural Earth II' you have a polar projection...

It could be helpful


Ive been working with that, but it doesn't provide much editability.. i'd rather not have the hydrography.
It is looking encouraging though!

Posted Image
Greg Moore

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#11
François Goulet

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Looks nice!

Have you tried to reproject it in ArcMap?

I'm guessing you want the dataset #3A Terrestrial data without hydrography/Environment colors and relief?

I supposed the image in geographic projection (the world file is there for download too) shouldn't be too hard to reproject...

#12
Greg

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Have you tried to reproject it in ArcMap?


I have tried ArcMAP and ArcCatalog to reproject the rasters, the cleanTOPO2 data looses it's classes when I reproject and is taking about 45 mins to render the pyramids.

I've just figured out that in Map Publisher you can place any georeferenced image using the standard "Place" tool in illustrator.. once it's in the document you can add it as a map layer. from there you can project and scale it.

So I'll play around with that a bit.
Greg Moore

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#13
frax

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CleanTOPO2 shouldn't be a big problem in Arc - remember that classes are not inherit in the dataset. You want to manipulate it as an integer grid. If it is float (don't remember) - convert it to integer first - makes processing much faster. To georeference it, type up a world file if none is delivered with the dataset (look in the Arc help, or use toolbox tools for that).

Then, for the reprojection, the key is to work with a small dataset as possible. Start to cut off things you don't need (anything below 30N or something for you - your map goes quite far south in Europe). You might want to reduce the resolution first too (resample) to make it leaner (depending on your output size).

After you reproject it, you prepare the hillshade in Arc, or export it to another software (e.g. Photoshop) for the shading.

A small comment - on the heading of your draft poster - "The Arctic - an endangered climate" - a climate can not be "endangered", climate will always be there in some shape or another - it might be changing though. The current state of Arctic ecosystems/ecoregions might be in danger though (of changing to another state).

:)
Hugo Ahlenius
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#14
Hans van der Maarel

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but mine has bathymetry as well so maybe SRTM30 Plus?


Thanks for pointing that one out. I didn't know about it yet and it looks like it's got more detail in the bathymetry than CleanTopo2 (more detail in land too), so it'll work nicely as an alternative.
Hans van der Maarel - Cartotalk Editor
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#15
Greg

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Thanks for the help everyone!
The topic has been moved to "Map Gallery"

http://www.cartotalk...wtopic=2992&hl=
Greg Moore

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