GIS

h1. Purpose of Survey

# The survey is conducted for generating a Base Map which is representative of Topography, Infrastructure, Drainage, Buildings etc, with a focus on Water Management in Auroville. Furthermore this survey can be used as base map to build upon more detailed surveys for the various purposes such as Town planning, Land Surveys, Transportation Planning etc.

+Use of Layers+

# *V-BLDG-SHED* (Shed) layer is used when the structure is not entirely enclosed, if At least one side is open (No walls/partition etc). One thumb rule is to answer the question if the building can be locked safely or not. If not, then it is a shed.

# *V-BLDG-HUT* (Hut) is used when the building (For human activity/living space) is single storey with roof made up of perishable material such as keet, straw etc.

# Use of *V-BLDG-ROOF* (Roof) is for buildings with permanent roofs extending out about more than 1 meter from the outline at ground level. It can also be used for complex roof structures for example Matrimandir Petals.

# Use of *V-BLDG-OTLN* (Building outline) is for depicting the outer line of walls of a structure on ground level. This is used when the roof of the building is more or less of the same profile.

# *V-BLDG-RTWL* (Retaining Wall) is for walls with the function of retaining either earth/water and the side of the wall should be visible. In case of very thin walls and no side visible, it comes as *V-BLDG-RWLL* (Retaining wall line). This is depicted as a single line in drawing.

# Use of *V-ROAD-CYCP* is for designated cycle path as a single line.

# Use of *V-ROAD-FPAT* is for pedestrian paths as a single line. It is used when there is a path of very small width. If the need is to represent a path/road which is unpaved in nature, *V-ROAD-UPVD* is used, which is polygon type. To represent a path/road of paved nature *V-ROAD-PAVD* is used, which is also a polygon type.

# *V-WMNG-PIPP* for pipe points, *V-WMNG-PIPL*- for pipe lines.

# *V-BLDG-BMRK* is for unidentified bench marks and *V-BLDG-MHOL* is for unidentified manholes.

# *V-BLDG-PLTF* is for impervious surfaces. for example sand and gravel will not come under this layer. cemented paths etc can come.

# *V-WMNG-POOL* is for water bodies made for leisure activities- like swimming pool etc.

# *V-WMNG-SUMP* is collectively for artificial water retention structures.

# *V-WATR-POND* is for top of natural water retention.

# *V-WATR-PONB* is for bottom of natural water retention.

# *V-WMNG-DRBA* is for bottom of artificial drains.

# *V-WMNG-DRTA* is for top of artificial drains.

# *V-WATR-DRBN* is for bottom of Natural drains.

# *V-WATR-DRTN* is for top of Natural drains.

# *V-WMNG-DRNC* is for drain covers.

# *V-WATR-DRAS* is for indicating slope of drainage, these are arrows.