Geog Heightfield Load - Revision history

Redmaw: Remarked out line of text indicating parameters only available in Professional version. Adjusted layout.

2022-11-02T17:54:12Z

Remarked out line of text indicating parameters only available in Professional version. Adjusted layout.

← Older revision		Revision as of 17:54, 2 November 2022
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	* '''Set to Min Height:''' Pressing this button well set the NODATA numeric entry field to a value equal to the lowest height found in the imported DEM file.		* '''Set to Min Height:''' Pressing this button well set the NODATA numeric entry field to a value equal to the lowest height found in the imported DEM file.
	* '''Update button:''' If you change the NODATA replacement value in the field to the left you will need to click this button to update the DEM with the new replacement values. The button is only available if "Replace NODATA values" is checked.		* '''Update button:''' If you change the NODATA replacement value in the field to the left you will need to click this button to update the DEM with the new replacement values. The button is only available if "Replace NODATA values" is checked.
			<!-- The following georeferencing settings are only available in the Professional edition: -->

	The following georeferencing settings are only available in the Professional edition:


	<ul>		<ul>
	<li>		<li>

Redmaw: Updated description to include feature availability on all versions of Terragen, not just Professional.

2022-11-02T16:41:46Z

Updated description to include feature availability on all versions of Terragen, not just Professional.

← Older revision		Revision as of 16:41, 2 November 2022
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	== How to use ==		== How to use ==
	Georeferencing settings are ~~only~~ available ~~in the Professional edition~~ of Terragen. However the correct size for the DEM will still be calculated based on georeferencing if needed. Without the georeferencing settings the position of the DEM will be controlled by the [[Heightfield Shader]] the Geog heightfield load node is attached to.		As of Terragen 4.6.30 Georeferencing settings are available on all vesions of Terragen. However the correct size for the DEM will still be calculated based on georeferencing if needed. Without the georeferencing settings the position of the DEM will be controlled by the [[Heightfield Shader]] the Geog heightfield load node is attached to.

	When you use a georeferenced DEM and the "Georeference" setting is checked it will be placed at the correct position on the planet. However accuracy falls away as you move away from the origin of the planet, which corresponds to 0° latitude, 0° longitude or the Prime Meridian at the Equator. To ensure the best accuracy we recommend that you move the planet's origin to the area you're interested in. For example, here are the steps to move the planet's origin to the southwest corner of the DEM:		When you use a georeferenced DEM and the "Georeference" setting is checked it will be placed at the correct position on the planet. However accuracy falls away as you move away from the origin of the planet, which corresponds to 0° latitude, 0° longitude or the Prime Meridian at the Equator. To ensure the best accuracy we recommend that you move the planet's origin to the area you're interested in. For example, here are the steps to move the planet's origin to the southwest corner of the DEM:

Redmaw: Updated description in Overview section for formats that Terragen supports.

2021-02-04T23:08:07Z

Updated description in Overview section for formats that Terragen supports.

← Older revision		Revision as of 23:08, 4 February 2021
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	The Geog heightfield load node can load and georeference digital elevation map (DEM) files. It supports many formats and projections. Geog heightfield load nodes can be created using the "Heightfield (load DEM)" item in the Add Terrain button menu at the top of the Terrain node list.		The Geog heightfield load node can load and georeference digital elevation map (DEM) files. It supports many formats and projections. Geog heightfield load nodes can be created using the "Heightfield (load DEM)" item in the Add Terrain button menu at the top of the Terrain node list.

	You can see a list of the supported DEM formats supported by the node [http://www.gdal.org/formats_list.html here]. Terragen supports all of the formats which have "~~Yes~~" in the "~~Compiled by default~~" column of the table on that page. Most commonly used DEM formats are supported. Please note that not all of the supported formats have been tested as there are many of them and some are quite obscure.		You can see a list of the supported DEM formats supported by the node [http://www.gdal.org/formats_list.html here]. Terragen supports all of the formats which have "Built-in by default" in the "Build requirements" column of the table on that page. Most commonly used DEM formats are supported. Please note that not all of the supported formats have been tested as there are many of them and some are quite obscure.

	You may notice that Terragen's TER terrain file format (.ter) is listed in the supported formats. However we recommend that you use a [[Heightfield Load]] node to load Terragen terrains, because it uses Terragen's native file loading.		You may notice that Terragen's TER terrain file format (.ter) is listed in the supported formats. However we recommend that you use a [[Heightfield Load]] node to load Terragen terrains, because it uses Terragen's native file loading.

Redmaw: Reformatted page to conform with new layout. Updated some descriptions.

2021-02-04T22:44:57Z

Reformatted page to conform with new layout. Updated some descriptions.

Show changes

JavaJones: Added screenshot

2019-03-13T02:40:24Z

Added screenshot

← Older revision		Revision as of 02:40, 13 March 2019
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	[[~~Image~~:~~work_in_progress~~.~~jpg~~\|center]]		[[File:geog-heightfield-load.png\|400px\|center]]

	'''Node Description and Purpose:'''<br />		'''Node Description and Purpose:'''<br />

JavaJones at 02:04, 13 March 2019

2019-03-13T02:04:05Z

← Older revision		Revision as of 02:04, 13 March 2019
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	* '''Filename:''' This parameter lets you specify the DEM file to be loaded. Click the File button on the right to open a file chooser dialog.		* '''Filename:''' This parameter lets you specify the DEM file to be loaded. Click the File button on the right to open a file chooser dialog.
	* '''Replace NODATA values:''' If this is checked any NODATA values in the DEM will be replaced with the value specified in the replacement value field to the right.		* '''Replace NODATA values:''' If this is checked any NODATA values in the DEM will be replaced with the value specified in the replacement value field to the right.
			* '''Set to Min Height:''' Pressing this button well set the NODATA numeric entry field to a value equal to the lowest height found in the imported DEM file.
	* '''Update button:''' If you change the NODATA replacement value in the field to the left you will need to click this button to update the DEM with the new replacement values. The button is only available if '''Replace NODATA values''' is checked.		* '''Update button:''' If you change the NODATA replacement value in the field to the left you will need to click this button to update the DEM with the new replacement values. The button is only available if '''Replace NODATA values''' is checked.

JavaJones at 01:55, 13 March 2019

2019-03-13T01:55:24Z

← Older revision		Revision as of 01:55, 13 March 2019
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	The Geog heightfield load node can load and georeference digital elevation map (DEM) files. It supports many formats and projections. Geog heightfield load nodes can be created using the "Heightfield (load DEM)" item in the Add Terrain button menu at the top of the Terrain node list.		The Geog heightfield load node can load and georeference digital elevation map (DEM) files. It supports many formats and projections. Geog heightfield load nodes can be created using the "Heightfield (load DEM)" item in the Add Terrain button menu at the top of the Terrain node list.

	You can see a list of the supported DEM formats supported by the node [http://www.gdal.org/formats_list.html here]. ~~TG3~~ supports all of the formats which have "Yes" in the "Compiled by default" column of the table on that page. Most commonly used DEM formats are supported. Please note that not all of the supported formats have been tested, there are a lot of them and some are quite obscure.		You can see a list of the supported DEM formats supported by the node [http://www.gdal.org/formats_list.html here]. Terragen supports all of the formats which have "Yes" in the "Compiled by default" column of the table on that page. Most commonly used DEM formats are supported. Please note that not all of the supported formats have been tested, there are a lot of them and some are quite obscure.

	You may notice that Terragen's TER terrain file format (.ter) is listed in the supported formats. However we recommend that you use a [[Heightfield Load]] node to load TG terrains, because that uses TG's native file loading.		You may notice that Terragen's TER terrain file format (.ter) is listed in the supported formats. However we recommend that you use a [[Heightfield Load]] node to load Terragen terrains, because that uses Terragen's native file loading.

	DEMs often come as a collection of files. If you're not familiar with the DEM format you may need to experiment to see which file to open. A reasonable guess often seems to be to choose the largest file.		DEMs often come as a collection of files. If you're not familiar with the DEM format you may need to experiment to see which file to open. A reasonable guess often seems to be to choose the largest file.

Jo at 02:47, 1 August 2013

2013-08-01T02:47:14Z

← Older revision		Revision as of 02:47, 1 August 2013
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	Georeferencing settings are only available in the Professional edition. However the correct size for the DEM will still be calculated based on georeferencing if needed. Without the georeferencing settings the position of the DEM will be controlled by the [[Heightfield Shader]] the Geog heightfield load node is attached to.		Georeferencing settings are only available in the Professional edition. However the correct size for the DEM will still be calculated based on georeferencing if needed. Without the georeferencing settings the position of the DEM will be controlled by the [[Heightfield Shader]] the Geog heightfield load node is attached to.

	When you use a georeferenced DEM and the '''Georeference''' parameter is checked it will be placed at the correct position on the planet. However accuracy falls away as you move away from the origin of the planet, ~~which is at the apex (~~which corresponds to 0° latitude, 0° longitude or the Prime Meridian at the Equator). To ensure the best accuracy it's suggested that you move the planet origin to the area you're interested in. It's easy to do this. Let's say you've loaded a DEM and it's georeferenced. We'll move the planet origin so that it's at the southwest corner of the DEM. Follow these steps:		When you use a georeferenced DEM and the '''Georeference''' parameter is checked it will be placed at the correct position on the planet. However accuracy falls away as you move away from the origin of the planet, which corresponds to 0° latitude, 0° longitude or the Prime Meridian at the Equator. To ensure the best accuracy it's suggested that you move the planet origin to the area you're interested in. It's easy to do this. Let's say you've loaded a DEM and it's georeferenced. We'll move the planet origin so that it's at the southwest corner of the DEM. Follow these steps:

	<ol>		<ol>

Jo at 02:46, 1 August 2013

2013-08-01T02:46:02Z

← Older revision		Revision as of 02:46, 1 August 2013
Line 12:		Line 12:
	Georeferencing settings are only available in the Professional edition. However the correct size for the DEM will still be calculated based on georeferencing if needed. Without the georeferencing settings the position of the DEM will be controlled by the [[Heightfield Shader]] the Geog heightfield load node is attached to.		Georeferencing settings are only available in the Professional edition. However the correct size for the DEM will still be calculated based on georeferencing if needed. Without the georeferencing settings the position of the DEM will be controlled by the [[Heightfield Shader]] the Geog heightfield load node is attached to.

	When you use a georeferenced DEM and the '''Georeference''' parameter is checked it will be placed at the correct position on the planet. However accuracy falls away as you move away from the origin of the planet, which is at the apex (~~more~~ or ~~less~~ the ~~North Pole~~). To ensure the best accuracy it's suggested that you move the planet origin to the area you're interested in. It's easy to do this. Let's say you've loaded a DEM and it's georeferenced. We'll move the planet origin so that it's at the southwest corner of the DEM. Follow these steps:		When you use a georeferenced DEM and the '''Georeference''' parameter is checked it will be placed at the correct position on the planet. However accuracy falls away as you move away from the origin of the planet, which is at the apex (which corresponds to 0° latitude, 0° longitude or the Prime Meridian at the Equator). To ensure the best accuracy it's suggested that you move the planet origin to the area you're interested in. It's easy to do this. Let's say you've loaded a DEM and it's georeferenced. We'll move the planet origin so that it's at the southwest corner of the DEM. Follow these steps:

	<ol>		<ol>

Jo at 04:47, 27 July 2013

2013-07-27T04:47:09Z

← Older revision		Revision as of 04:47, 27 July 2013
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	Open the parameter view for the Planet 01 node (the default planet object). You can find this in the Objects node list or double click on the node in the network view.		Open the parameter view for the Planet 01 node (the default planet object). You can find this in the Objects node list or double click on the node in the network view.
	</li><li>		</li><li>
	Paste the values into the planet's '''Lat long at apex''' parameter. You ~~can~~ use the copy/paste button for this again. Click the button and choose "Paste coordinates".		Paste the values into the planet's '''Lat long at apex''' parameter. You should use the copy/paste button for this again. Click the button and choose "Paste coordinates".
	</li>		</li>
	</ol>		</ol>
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	Those steps move the planet origin to the area you're interested and should ensure the best results.		Those steps move the planet origin to the area you're interested and should ensure the best results.

	The node allows you to replace NODATA values with a different value. NODATA values indicate areas in the DEM without valid data, which can often give the appearance of holes and similar in the terrain. [[The Library\|Library]] previews for ~~DEMS~~ show NODATA areas drawn in red.		The node allows you to replace NODATA values with a different value. NODATA values indicate areas in the DEM without valid data, which can often give the appearance of holes and similar in the terrain. [[The Library\|Library]] previews for DEMs show NODATA areas drawn in red.

	The node uses [http://www.gdal.org GDAL] and [https://trac.osgeo.org/proj/ PROJ.4] to load and georeference DEM files.		The node uses [http://www.gdal.org GDAL] and [https://trac.osgeo.org/proj/ PROJ.4] to load and georeference DEM files.