Method of Storing Raster Image in Run Lengths Having Variable Numbers of Bytes and Medium with Raster Image Thus Stored

Metadata Updated: December 5, 2019

The invention implements a run-length file format with improved space-sav qualities. The file starts with a header in ASCII format and includes information such as the file format, maximum X and Y values, and a color palette. The binary raster data include at least one byte for each pixel run to indicate the color selected from the color palette and the run length. Concatenation flags demarcate groups of bytes. According to a first embodiment, each run is indicated by a variable-length sequence of bytes with the color in a fixed-length field and the repeat number in a variable-length field. According to a second embodiment, the color and run length are given in separate byte strings, each having a variable length. The file also includes line offset pointers to permit navigation of the file without decompressing it and thus to facilitate operations such as panning and zooming

Access & Use Information

Public: This dataset is intended for public access and use. License: Creative Commons Attribution

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Dates

Metadata Created Date May 20, 2015
Metadata Updated Date December 5, 2019

Metadata Source

Harvested from Commerce Non Spatial Data.json Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 20, 2015
Metadata Updated Date December 5, 2019
Publisher Department of Commerce
Unique Identifier TT-000041
Maintainer
Derek Parks
Maintainer Email
Public Access Level public
Bureau Code 006:48
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id ee64d7a1-e7e4-4028-b7ee-2b1a82ee98a1
Harvest Source Id 0836a94a-b3c8-4190-a145-bddc06458b2c
Harvest Source Title Commerce Non Spatial Data.json Harvest Source
License https://creativecommons.org/licenses/by/4.0
Data Last Modified 2014-06-24
Program Code 006:000
Source Datajson Identifier True
Source Hash 94718f115b848eb1385bb055f29da22f45f939d1
Source Schema Version 1.1

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