Memory Pools: describing and working with custom allocators 4.9. Details of Memcheck's checking machinery 4.5.1. Overlapping source and destination blocks 4.2.7. When a heap block is freed with an inappropriate deallocationįunction 4.2.6. Use of uninitialised or unaddressable values in systemĬalls 4.2.4. Illegal read / Illegal write errors 4.2.2.

Explanation of error messages from Memcheck 4.2.1. Kudos to anyone who answers my question before I do.Table of Contents 4.1. The real question I have is, 'Does autocad and ADT support LDID and.

dbf) for identifying the character encoding to be used cpg - used to specify the code page (only for. shp.xml - geospatial metadata in XML format, such as ISO 19115 or other XML schema mxs - a geocoding index for read-write shapefiles (ODB format) ixs - a geocoding index for read-write shapefiles aih - an attribute index of the active fields in a table fbx - a spatial index of the features for shapefiles that are read-only prj - projection format the coordinate system and projection information, a plain text file describing the projection using well-known text format dbf - attribute format columnar attributes for each shape, in dBase IV format shx - shape index format a positional index of the feature geometry to allow seeking forwards and backwards quickly shp - shape format the feature geometry itself It's a lenght-fixed (function by lookup table) sbx file contains the record number and the length in bytes of the corresponding bin record in the. sbx (spatial bin index) file contains rowsĮach rows in the. When user run a spatial query only features that intersect the bins are considered (faster searchr). shp file in rectangular areas (bins).Įach bin contains the numbers record of the features in the. sbn (spatial bin) file divides the area of. User can create an index choosing 'create index' for shape field. cpg for anyone who uses international data.Īrcview creates a spatial index if you run a spatial join or select by theme.

Then factor readers and writers with datasets with UTF16 verses UTF32 to compound the issue. Although most people only use straight ASCII and this will never apply to them. dbf of theshapefile data will be pretty useless. Without this, your japanese characters stored in the. cpg or code page assigns the ansi or unicode codepage for the data if there is no LDID reference. The LDID is the dBase language driver ID that assigns character encoding to a shapefile. I'm not even going into projection/datum issues of the not so standard standard of EPSG numbers and how spherical mercator meter can have two valid EPSG's.Ĭode pages are necessary even though not mandatory (even though virtually no one seems to know much about them). If you don't know the projection, obviously that is an issue. Just because a file extension is not mandatory to display a shapefile, not having a particular file extension can cause issues.

File extension freelist