braindump
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braindump [2018/04/17 22:00] – [Ellipsoids] allchin09 | braindump [2018/10/09 16:16] – [Datums] allchin09 | ||
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However, the mapping section has already be moved from Prince Albert Rd Sydney, out to Bathurst. No longer can one walk into an LPI building in Sydney to make mapping related enquiries, or to look at aerial images through a set of stereo glasses. | However, the mapping section has already be moved from Prince Albert Rd Sydney, out to Bathurst. No longer can one walk into an LPI building in Sydney to make mapping related enquiries, or to look at aerial images through a set of stereo glasses. | ||
+ | |||
+ | ==== Half of NSW topographic maps no longer printed ==== | ||
+ | From 3rd September 2018, 524 out of their 1,094 titles for the state were only made available in digital form from Spatial Services. By area, this covered about 3/4 of the state. | ||
+ | |||
+ | A notice regarding the change can be found [[http:// | ||
+ | |||
+ | [[http:// | ||
+ | |||
+ | {{ :: | ||
===== Geographic Names Board ===== | ===== Geographic Names Board ===== | ||
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* Elevation Data | * Elevation Data | ||
* [[http:// | * [[http:// | ||
+ | |||
+ | ====== Terminology ====== | ||
+ | Well defined and consistant terminology goes a long way to assist in clear and well understood communication. | ||
+ | |||
+ | Refer to the [[terminology]] page for further information. | ||
====== Datums ====== | ====== Datums ====== | ||
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==== AGD66 ==== | ==== AGD66 ==== | ||
- | The datum used on topographic maps before GDA94. 2nd Edition topographic maps use the AMG66 projection which is derived from AGD66. | + | The datum used on topographic maps before GDA94. |
==== Australian National Grid (ANG) ==== | ==== Australian National Grid (ANG) ==== | ||
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===== Web Mercator (EPSG: | ===== Web Mercator (EPSG: | ||
- | Used in many popular web mapping applications (Google/ | + | Used in many popular web mapping applications (Google/ |
+ | |||
+ | For details on the issues using Web Mercator for geospatial applications, | ||
+ | Web Mercator Map Projection]] | ||
===== Universal Transverse Mecator (UTM) ===== | ===== Universal Transverse Mecator (UTM) ===== | ||
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^Parameter | ^Parameter | ||
- | ^Major Semi Axis | 6378293.645 | + | ^Major Semi Axis (m) |
^Inverse Flattening | ^Inverse Flattening | ||
^Used in | ANG | AGD, AMG | GDA, MGA | GPS | | ^Used in | ANG | AGD, AMG | GDA, MGA | GPS | |
braindump.txt · Last modified: 2021/03/07 22:06 by allchin09