This value will get use only if field number 2 is blank/missing. The third field is a user defined text value used to indicate a missing or null value.The second field is the missing or null data value as it will be found in the data section.The first field is the field width of each grid node as stored in the data section below the last (below the header part).The third is an integer that indicates the number of grid nodes per physical line.The second, for a grid file, must be “GRID”.The first is user defined but many times is just “GRID FILE”. On line number 1, there are three fields: FILE, GRID, 4Ġ.0, 0.0, is header from above sample. The data starts on the first line after the last symbol, and there may only be two. The header section is starts with the first line that has an symbol. There are two sections in ZMAP+, header section and data section. Hence If the first character is a “!” the line is a comment. There are a specific set of header rows that define how the data is written in the file and actual data followed by the header.Ġ.0, 0.0, -9999.0000000 3.0000000 32.0000000 The format can also support point and polygon data, but only one data type is allowed in each file. It is commonly used in applications in the Oil and Gas Exploration field’s applications read and write the format. The ZMapPlus is an old format used to store gridded data in an ASCII line format for transport and storage. In this article I want to share my findings on how to interpret the ZMAP file format.
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