Project Ilam specification
This page contains all the technical information about the mapping procedure, Tags, feature recognition,and some bad mapping examples
Mappers from Western countries (people who are remotely mapping) on the project should focus on the geometry development (Point, Line, Polygon) with highest possible spatial accuracy. People nearby or at Nepal (Local People) should Name the features and add other important attributes of the spatial data. Progress of geometry data as well as attribute information should be updated together. The collaboration of International mappers and local people makes the complete map because only geometry or the only text can never give complete information.
We can use following tools to map on this project:
some users may also use ID editor to contribute their work.
The positioning reference for drawn objects is Bing.
Under http://mapcraft.nanodesu.ru/pie/651# you can reserve one or more slices to map, which help us to coordinate mapping progress.
- Desidered precision regarding areas: Mapping accuracy should be less than size of common village building.
- Desidered precision of ways: Ways with the class higher than truck may not leave the area of the street.
Example for ways:
Recognition of Elements from aerial images
Characteristic: olive dark green mostly. Homogene colour from the top view.
Example from aerial view:
What not to do
- Too big landuse=residential
- No landuse=farmland
- Wrong positioning and some wrong shapes of buildings
- Wrong positioning of ways
Common in lot of agriculture areas in Nepal is terraced farmland. Often between terraces one may see irregular trees. Such areas are not natural=crop.
Forest verus Scrub?
Scrub is area with less density of trees. The terrain is more visible than crown of trees.
there are two kinds of sand areas in Nepal. Artificial, like here:
Mostly areaa of schools where the children are playing or local market places.
and natural like:
An example: http://www.openstreetmap.org/way/506333419 Orange tree orchard in Manakamana.