Metadata Italy

Data URL WCS Link
Data URL ESRI Grid Link
Metadata URL Link
Horizontal Reference System EPSG:4326
Vertical Reference System

requested

Resolution [m] 20.0
Distributor Geoportale Nationale
License AccessConstraints: Nessuno - None
EVRF 2000 Offset [cm] -35

Tab. 1: Basic data

Regional high resolution DTMs (sicily, sardinia, tuscany, trentino, south tyrol or lombardia) were not taken into account yet.

The dataset should be from October 2012. The WCS offers no date at all:

http://wms.pcn.minambiente.it/wcs/dtm_20m?service=wcs&request=getCapabilities

But there is another download as ESRI Grid File: https://directory.spatineo.com/service/46314/ with the creation date 10/2012.

The WCS is not covering Vatikan City, but the Grid File is.

The WCS data was filled with the missing data from the Grid file.

There were some voids in the area of Occhiobello:

voids

Voids in Cyan. Map © OpenStreetMap contributors

The voids were filled with gdal_fillnodata.

The WCS contains the null values 0 and 32767. Thus 0 can be a real value, the raster dataset was subsetted with a polygon of italy and all null values where set to -32768 (with r.null from GRASS you could set multiple values to null).

Despite the different resolutions and ages compared to the high resolution DTMs of Slovenia and Austria the results are surprisingly good.

east

north

slowenia

austria

italy

4605878.7

2607845.2

1358.89

1362.0436

1362

4605937.6

2607810.0

1341.07

1342.2933

1340

4605913.8

2607835.9

1354.12

1358.0585

1368

4606031.6

2607896.8

1367.0399

1369.049

1379

4606034.3

2607888.4

1363.0299

1363.7238

1363

4606025.2

2607724.9

1289.59

1293.9471

1294

4606081.0

2607848.1

1354.9199

1356.105

1344

4606090.9

2607762.7

1315.82

1320.8695

1310

4606135.1

2607904.3

1399.8999

1400.7782

1398

4606124.0

2607753.2

1313.23

1312.2775

1310

4606134.9

2607837.0

1364.46

1367.081

1361

4606185.6

2607944.8

1429.71

1429.7712

1433

4606201.4

2607848.8

1369.36

1374.4554

1369

4606185.8

2607936.9

1426.13

1429.7712

1433

4606182.6

2607842.4

1368.61

1369.6318

1369

4606173.4

2607865.3

1384.44

1383.5278

1380

4606164.5

2607933.7

1423.73

1424.484

1426

4606158.2

2607959.3

1433.25

1433.6749

1439

4606123.8

2608009.8

1443.47

1445.0048

1434

4606120.6

2607906.5

1395.8099

1397.9384

1398

Table 1: Comparison of the datasets values in overlapping areas. EPSG:3035 and height in meters.

 

Mean Deviation [m]

Min [m]

Max [m]

Slovenia vs. Austria

2.08

0.06

5.10

Slovenia vs. Italy

4.74

0.03

11.96

Italy vs. Austria

4.55

0.05

11.00

Table 2: Statistics of the comparison between the datasets above.

But take into account that the overlapping area and the sample is quite small and the area is mountainous.

 

 

 

 

 

 

 

 

 

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