Creating and visiting method for GKF three-dimensional space database
A three-dimensional space and database technology, applied in image data processing, electrical digital data processing, special data processing applications, etc., can solve problems such as low efficiency and slow database speed
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Embodiment 1
[0096] Example 1, such as figure 1 As shown, a method for creating a GKF three-dimensional spatial database is carried out in the following steps:
[0097] A1. Analyze and create the type of data set. If it is a 3D model data set, perform step A2; if it is a 3D terrain data set, perform step A3; if it is an oblique photography data set, perform step A4;
[0098] A2. Create a GKF three-dimensional spatial database of the three-dimensional model data set type, and execute A21-A25 in sequence;
[0099] A21, the metadata of the 3D model data set is stored in the database, and A211-A215 is executed sequentially;
[0100] A211. Obtain the 3D model data set information, the 3D model data set information includes version, UUID, name, alias, data production unit, creation date, number of metadata records, and number of data records;
[0101] A212. Obtain a list of scene layers, which is a list of tuples of ;
[0102] A213. Obtain 3D model information, the 3D model information includ...
Embodiment 2
[0136] Example 2, such as figure 2 Shown, a kind of GKF three-dimensional spatial database access method is carried out according to the following steps:
[0137] B1. Read the GKX data record file. Execute B211-B215 sequentially;
[0138] B211, open corresponding GKX data record file flow, read GKXHeader structure, described GKXHeader structure is as shown in A314, A312, A413;
[0139] B212. Read and use the ZIP algorithm to decompress the metadata records and data records, and store them in BUFFER;
[0140] B213, close the GKX data recording file flow;
[0141] B214. Read metadata records in BUFFER;
[0142] B215, read the data record in BUFFER, establish the corresponding Map of data name and data record;
[0143] B2. Create a memory mapping environment for the GKF file. Execute steps B221-B224 in sequence;
[0144] B221, use the CreateFile function to create a handle to the GKF file in read-only mode;
[0145] B222, use the GetFileSizeEx function to obtain the size...
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