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Data Importing Shapefiles [back to main data importing menu] Shapefiles originated as a way of storing objects in an ESRI Geographical Information System (GIS). In addition to storing the 2- or 3-dimensional co-ordinates of map objects, they can also store any number of other attributes about the object, such as the traffic flow data for a road. DXF files cannot do this. However, unlike a DXF file, each shapefile can only contain one type of object, although there may be thousands or even millions of that type of object in the file. What Information do you need? If you are using shapefile format, then ideally you will need the following shapefiles:
NoiseMap gives you a lot of flexibility about the content of each of these files. The preferred content of each of these files is described in Appendix 1 of the main NoiseMap manual. Very often, some of the information will be missing from the shapefiles that you have been given. There are several options for dealing with this, which are illustrated by the following examples. There are many other possibilities. Using Default Values Calculating Missing Values Importing from another Shapefile |
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