Kathmandu Valley Spatial Database With Contour And Road Layers

A GIS database integrates satellite imagery and historical topographic maps to address spatial data gaps in Nepal's Kathmandu Valley. It includes vector layers such as 'Contours' and 'Roads' digitized from 1905 source maps at a 1:25000 scale. The database was developed by CEOS_EXTRA to support planning and management efforts.

Use Cases

• Analyze terrain elevation and slope using the 'Contours' line feature layer for flood risk modeling.
• Map and assess transportation networks by studying the 'Roads' line feature layer for urban connectivity analysis.
• Conduct historical landscape change detection by comparing the digitized 1905 'Source Map Date' features with contemporary satellite imagery.
• Perform spatial analysis for urban planning using integrated layers like 'Contours' and 'Roads' within a common 'transverse mercator' projection.

Strengths

• Includes foundational vector layers like 'Contours' and 'Roads' with documented 'Feature_type'.
• Source data specifications are provided, including 'Source Map Scale' of 25000 and 'Projection_meas' in Meters.

Limitations

• Sample data and total row counts for vector layers are unavailable, making volume assessment impossible.
• Core data layers are derived from historical 'Source Map Date' of 1905-06-17, which may not reflect current conditions.
• The description lacks details on the number of integrated satellite imagery types or their resolution.

Provenance

Source

CEOS_EXTRA via NASA Earthdata.

Collection Method

Digitized from historical topographic sheets ('topo sheets') and integrated with satellite imageries.

Time Range

Source map date is 1905-06-17; temporal coverage of integrated satellite data is unknown.

Freshness

null

Geography

Kathmandu Valley, Nepal.