![]() ![]() If not already installed,copy the sample datafiles for this booklet (seepage 2) to your harddrive These operations let you deal with a vari-ety of Geographic Information System (GIS) analy-sis and management issues. This booklet begins with an explanation of vectortopology types then moves to an exercise in whichyou use the Vector Extract process to extract partof a vector object for use in generating buffer zonesand subsequent vector combination operations.There are also exercises in Polygon Fitting and youare introduced to Point Density Rasters and GridAnalysis. You can get thesame results from the Vector Merge process as fromthe Add operation in Vector Combinations, but Vec-tor Combinations also provides the flexibility toselect a subset of the vector elements and / or lessthan the full object extents. You could, for example, get thesame results as the first exercise (Extracting VectorElements) by using the designated region to copythe same elements in TNT’s spatial Editor and past-ing them into a new vector object. Typically in TNTmips, there is more than one wayto reach a result. Ob-ject coordinates are used for positioning if none ofthe objects are georeferenced. All appro-priate transformations are applied so that the ob-jects need not be in the same map projection. These processes use georeference information toposition objects relative to one another. The processes consid-ered here include creating a subset of elements froman existing vector object, generating simple andmore complex buffer zones, polygon fitting toswarms of vector points, merging and combiningvector objects in a variety of ways, dissolving adja-cent polygons based on shared attributes, rastergeneration based on point density, and grid analy-sis operations. Vector Analysis OperationsA variety of TNTmips processes are involved intopological vector analysis. You can also download an installation guide, sampledata, and the latest version of TNTmips Free. The web site is your source of the newest tutorial bookletson this and other topics. You can print or read this booklet from MicroImages’ web site or from theversion you install. This bookletrefers to TNTmips, TNTedit, TNTmips Free, and TNTview as “TNT.” If you did notpurchase the professional version (which requires a software license key) orTNTmips Basic, then TNTmips operates in TNTmips Free mode. Allversions run exactly the same code from the TNT products DVD. TNTmips® Pro and TNTmips Free TNTmips (the Map and Image ProcessingSystem) comes in three versions: the professional version of TNTmips (TNTmipsPro), the low cost TNTmips Basic version, and the TNTmips Free version. Consult the online materials atfor more information. More Documentation This booklet is intended only as an introduction to thevector analysis functions in TNTmips. Make a read-write copy ofall the sample data in the VECTORAN directory and CB_ELEV on your hard drive sochanges can be saved when you use these objects. There are alsoquery (*.qry) files that are needed for the exercises. The objectsin the NE_DLG and EASTNGULFCOAST Project Files in this directory are also used as isare objects from some of the Project Files in the CB_DATA directory. The first exercises inthis booklet use the VAO Project File in the VECTORAN directory of DATA. If you do not have access to a TNT products DVD,you can download the data from MicroImages’ web site. Sample Data The exercises presented in this booklet use sample data distrib-uted with the TNT products. Please consult these booklets for any review you need. Prerequisite Skills This booklet assumes you have completed the exercises inthe Displaying Geospatial Data and TNT Product Concepts tutorial booklets.Those exercises introduce essential skills and basic techniques that are not cov-ered again here. ![]() These tools are not available in TNTview® or TNTedit™. Before Getting StartedThis booklet introduces techniques used for common GIS tasks, such as updat-ing vector objects, generating buffer zones, dissolving boundaries between poly-gons with similar attributes, and using one vector as a cookie cutter for another.Through a series of exercises, it familiarizes you with the basic tools in thepowerful vector analysis processes that are part of TNTmips® from MicroImages,Inc. ![]()
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