QUOTE (Carsten @ Nov 21 2009, 11:29 AM)
Really nice work Michael. Could you give a short tutorial on how to import the data and convert it into a DEM? What projections are to be used?
Carsten,
I'm glad you like the maps. My method applies the following steps with ArcGIS software (www.esri.com):
After downloading the large LALT_GGT_NUM dataset from the JAXA, I used an ArcGIS tool called "ASCII 3D to Feature Class". This tool is designed to import an ASCII file with x,y,z values to create a multipoint feature class, a point data structure designed to scale up to billions of elevation points, such as you encounter with lidar data.
From the multipoint feature class, I created a terrain dataset. A terrain dataset is a generic GIS data structure which is essentially a multi-resolution triangulated irregular network. See
http://webhelp.esri.com/arcgisdesktop/9.3/...ataset_conceptsFrom the terrain dataset, I exported a raster dataset.
From the raster dataset, I applied a geoprocessing model that applies two cartographic effects: hillshaded-relief plus hypsometric tints using a color ramp. This model is described at
http://blogs.esri.com/Support/blogs/mappin...de-toolbox.aspxThis technique is a modern implementation of shaded relief pioneered by the Swiss cartographer, Eduard Imhof, in his classic book, Cartographic Relief Presentation, first published in 1965.
In those maps, I use two map projections, Mollweide for the full global view of the Moon, and Orthographic for the four hemispheric views.
Through my work, I have access to the ArcGIS software suite. This is professional grade GIS software that most space enthusiasts could not casually purchase, so I know that my method is not easily adapted by most on this forum. But this was a quick and fun project for me because I am presently writing a textbook on geographic data modeling and this was a good application of terrain visualization methods.
Also, when I examined the DEM built from the LALT_GGT_NUM dataset, I found a large fictitious lunar mountain at selenographic coordinates 16d 11m N, 87d 33m E
I made a slope map from the Kaguya DEM and categorized the peaks with the greatest slopes on the Moon. Some suspicious lunar peaks are at
48 19 S, 141 22 E, 63 degree slope
16 11 N, 87 33 E, 60 degree slope
20 56 N, 60 32 E, 58 degree slope
48 11 S, 8 48 W, 56 degree slope
32 26 S, 58 57 E, 55 degree slope
22 15 N, 81 53 E, 52 degree slope
59 11 S, 46 16 E, 50 degree slope
61 38 N, 8 16 W, 47 degree slope
66 29 N, 70 10 W, 46 degree slope
I don't necessarily assert each one of the peaks are false, but they are suspicious because of their high slope values.
regards, Michael Zeiler ESRI