![]() ![]() ![]() For example, it may be sufficient to use a 4-byte real number rather than a higher precision 8-byte real number. Use the most compact data type for each band.A Classified field may result in a smaller file than a Continuous field. An ImagePalette field may result in a smaller file than an Image field. Use the most efficient and most appropriate field type for the data.The following issues ought to be considered – Smaller files are less expensive to store and transport and smaller data streams are faster to transfer across the internet. Consequently, two rasters in MRR format that are the same grid size will almost certainly have different file sizes.Ī common goal, when creating an MRR, is to minimise the file size. So, the file size of an MRR depends more on the amount of incompressible information in the data than on the amount of data. MRR uses compression codecs to compress all data prior to storing it. All data, including metadata, is likely to be stored in a compressed state.There will be a variable amount of metadata.There will be a full set of overview levels.Each cell contains a validity flag (which may be stored per band or per field).A field may contain multiple events, each of which can contain a different amount of data.An MRR may have multiple fields and multiple bands in each field.The grid size is not a good indication of the number of cells in an MRR.This rule does not apply for an MRR and computing the file size of an MRR is far more complicated for the following reasons – So, the file size was related to the grid size. You would compute the grid size (the product of the number of columns and rows) and multiply this by the size of the raster data type. The file size of a raster used to be easy to calculate. In an MRR we can extend this concept, as MRR does not have a simple rectangular structure. The grid size is the number of cells in a raster, usually expressed as the product of the number of columns and rows. In other words, it is the amount of storage space used on your HDD, SDD or Cloud Drive to store a raster. The file size is the sum, expressed as the number of bytes, of all the files that are used to store the raster. What do we mean by this? How do we measure size? We can measure it in two ways – File Size and Grid Size. Raster Size Concepts Explained – How big is my raster?Ī raster in MRR format can have a virtually unlimited size. ![]()
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