Buffering by any field or legend classification, and with or without automatic attribute attachment, including dissolve and band buffer options.
theEngine will do standard GIS buffering, but it will also do very clever buffering, making use of the target database. This illustration shows a number of sophisticated operations. First, on the right, a point theme is buffered to size on one field classification and at the same time, the fields and attributes of the point theme are automatically added to the circular buffer file. Since this now contains the originating attributes, it can be colour mapped to a second field, and at the same time can have point symbols classified by a third field on top of this. Thus, three different fields can be mapped, by size, colour, and symbol. On the left are band buffers which can be totally inside, outside, or simply span the buffered polygons. They also have the database from the original theme automatically attached. The buffer polygons illustrated in the center area are standard buffers, but they are buffered by legend classification because unique attribute values are too extensive to buffer properly. For overlapping features.
Buffering actions automatically make a shapefile with area/perimeter. You may add to this file or make a new one.
Have buffering results merged (dissolve) or not.
Automatically add fields and attribute values from the features being buffered to the buffer shapefile.
Buffers by a constant value, with all of above options.
Buffers by automatically classified field data, entering constants into a dialogue box against a listing of unique values, like a look up table, but easier.
Buffers by legend classification entering constants into a dialogue box against a listing of legend classification values, like a look up table, but easier, with all of above options.
Band buffer polygon features, that is, create a band inside outside or over the perimeter of polygon features, with all of above options. v
A neat trick . . .
A common problem in GIS is what to with features laying one on top of the other. With theEngine a very sophisticated buffering trick is available. First you buffer the features with attributes based on a field classification. This function automatically copies all fields and attributes over to the buffer polygons. Then run the 'make donuts' request to automatically nest the buffer polygons inside each other, like islands within islands. The result is a ring that is unique for each of the overlying features. Simply map by a field value and that's it.
In the illustration above, overlying points (at different elevations) were buffered, as shown on the left, a copy was made and moved over to the right. 3D Extrude, processed on the buffer 'ring' polygons and the points at the same time using common parameters, produced the view on the right. The rings and points maintain their respective and identical attributes. Thus to get GIS information about the 5th level you would click on the 5th ring in the flat view, or either the points or rings in the 3D view. This example was easily made in just a few minutes with theEngine, using multiple functions working together, in this case . . . Buffer w/Attributes, Make Donuts, ExtractSel, Move, 3D Extrude . . . all just a mouse click away. Top