topo map

Ebergotzen

Short title: 
eberg

Ebergötzen is 10x10 km study area in the vicinity of the city of Göttingen in Central Germany (51°30'03.16''--51°35'31.45''N; 10°00'28.67''--10°09'15.21''E). This area has been extensively surveyed over the years, mainly for the purposes of developing operational digital soil mapping techniques. The dataset has also been frequently used by the SAGA development team and the SciLands GmbH in many of their demonstrations and documents.

Location

Ebergotzen
Germany
51° 34' 19.2324" N, 10° 6' 28.7964" E
Available layers: 

- points.dbf --- --- the point dataset consists of lab measurements four variables are available: SAND, SILT and CLAY (all expressed as % of mass measured for the 0-30 cm layer of soil) and SOILTYPE (type of soil based on the German classification system).
- DEM25.asc --- 25 m DEM derived from the topo-maps;
- DEM100.asc --- 100 m SRTM DEM;
- landimg.lan --- LANDSAT image bands obtained from the http://image2000.jrc.it & Corine Land Cover 2000 Project. The image consists of seven bands.
- ZONES%.asc --- 1:50.000 geological map of Germany.

Grid definition: 

ncols: 400
nrows: 400
xllcorner: 3570000
yllcorner: 5708000
cellsize: 25 m

proj4: 
+init=epsg:31467
Lineage: 

All input raster maps are in ArcInfo *.asc format, and the point data (tables) are in a *.dbf format. All coordinates are in the official German coordinate system, zone 3 (germany3): Transverse Mercator Projection, central meridian is 9°, false easting 3500000, Bessel 1841 ellipsoid with Potsdam datum. The bounding coordinates of the study area are: XMIN=3570000, YMIN=5708000, XMAX=3580000, YMAX=5718000. The input raster maps are available in two grid resolutions: 25 m (fine) and 100 m (coarse). The sand, silt and clay values have been determined by using the so-called texture by hand method: a surveyor distinguishes to which of the 32 texture classes a soil samples belongs to, and then estimates the content of fractions. E.g. texture class St2 has 10% clay, 25% silt and 65% sand.

Data owner: 
State Authority for Mining, Energy and Geology, Hannover, Germany
Location: 
Ebergotzen
Germany
51° 34' 19.2324" N, 10° 6' 28.7964" E

Volcano Maungawhau

Short title: 
volcano

Maunga Whau (Mt Eden) is one of about 50 volcanos in the Auckland volcanic field. This data set gives topographic information for Maunga Whau on a 10 m by 10 m grid. A matrix with 87 rows and 61 columns, rows corresponding to grid lines running east to west and columns to grid lines running south to north.

Location

Volcano Maungawhau Auckland
New Zealand
36° 50' 50.586" S, 174° 45' 56.646" E
Available layers: 

- volcano_maungawhau.asc --- the 10 m DEM digitized from the topo map;

Grid definition: 

ncols: 61
nrows: 87
xllcorner: 2667400
yllcorner: 6478700
cellsize: 10 m

proj4: 
+init=epsg:27200
Lineage: 

Digitized from a topographic map by Ross Ihaka. These data should not be regarded as accurate.

> data(volcano)
> library(spatstat)
> LLC <- data.frame(E=174.761345, N=-36.879784)
> coordinates(LLC) <- ~E+N
> proj4string(LLC) <- CRS("+proj=longlat +datum=WGS84")
> LLC.NZGD49 <- spTransform(LLC, CRS("+init=epsg:27200"))
> volcano.r <- as.im(list(x=seq(from=2667405, length.out=61, by=10),
+     y=seq(from=6478705, length.out=87, by=10), 
+     z=t(volcano)[61:1,]))
> volcano.sp <- as(volcano.r, "SpatialGridDataFrame")
> proj4string(volcano.sp) <- CRS("+init=epsg:27200")
# str(volcano.sp)
# spplot(volcano.sp, at=seq(min(volcano.sp$v), max(volcano.sp$v),5),
+    col.regions=topo.colors(45))
> write.asciigrid(volcano.sp, "volcano_maungawhau.asc", na.value=-1)
Data owner: 
LINZ
Location: 
Volcano Maungawhau Auckland
New Zealand
36° 50' 50.586" S, 174° 45' 56.646" E