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<html><head><title>Arc/Info Binary Coverage</title></head><body bgcolor="#ffffff"><h1>Arc/Info Binary Coverage</h1>Arc/Info Binary Coverages (eg. Arc/Info V7 and earlier) are supported byOGR for read access.  <p>The label, arc, polygon, centroid, region and text sections of a coverage are all supported as layers.  Attributes from INFOare appended to labels, arcs, polygons or region where appropriate.  Whenavailable the projection information is read and translated.  Polygon geometries are collected for polygon and region layers from the composing arcs.<p>Text sections are represented as point layers.  Display height is preservedin the HEIGHT attribute field; however, other information about text orientation is discarded.<p>Info tables associated with a coverage, but not sepecifically named to beattached to one of the existing geometric layers is currently not accessablethrough OGR.  Note that info tables are stored in an 'info' directory atthe same level as the coverage directory.  If this is inaccessable or corrupt no info attributes will be appended to coverage layers, but thegeometry should still be accessable.<p>The layers are named as follows:<ol><li> A label layer (polygon labels, or free standing points) is namedLAB if present. <p><li> A centroid layer (polygon centroids) is named CNT if present. <p><li> An arc (line) layer is named ARC if present. <p><li> A polygon layer is named "PAL" if present.<p><li> A text section is named according to the section subclass. <p><li> A region subclass is named according to the subclass name. <p></ol>The Arc/Info binary coverage driver attempts to optimize spatial queriesbut due to the lack of a spatial index this is just accomplished by minimizingprocessing for features not within the spatial window.<p>Random (by FID) reads of arcs, and polygons is supported it may not be supported for other feature types.<p><h2>See Also</h2><ul><li> <a href="http://avce00.maptools.org/">AVCE00 Library Page</a> </ul></body></html>

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