Skip to content

Commit

Permalink
update
Browse files Browse the repository at this point in the history
  • Loading branch information
JanCaha committed Jan 13, 2025
1 parent 38c2bbc commit 98a668c
Showing 1 changed file with 7 additions and 3 deletions.
10 changes: 7 additions & 3 deletions website/pages/index.md
Original file line number Diff line number Diff line change
Expand Up @@ -29,13 +29,17 @@ A local horizon is any horizon on the LoS that is not global. There may be multi

Most tools in the plugin allow you to use more than one DEM raster. The rasters are ordered from the smallest cell size to the largest. The cell size of each raster must be unique to form a complete ordering of rasters. Elevation is always obtained from the raster with the smallest cell size that has a valid elevation value (no data is not considered a valid value). This allows the utilization of DEMs with large cells in addition to DEMs with smaller cells. For example, a DEM with a cell size of 1 meter can be used within a city for areas close to observers, and SRTM data (30 meter cell size) can be used in areas around the city, far from the observer.

In LoS creation processing tools ([Create Global LoS](./tools/LoS%20Creation/tool_create_global_los.md), [Create Local LoS](./tools/LoS%20Creation/tool_create_local_los.md), [Create No Target LoS](./tools/LoS%20Creation/tool_create_notarget_los.md)), the DEMs are specified as one parameter, and during processing, the rasters are ordered and used as described above. In interactive tools ([Create LoS Tools](./interactive%20tools/tool_create_los.md), [Create LoS No Target Tool](./interactive%20tools/tool_los_without_target.md)), the rasters are obtained from the plugin itself (where the list is stored) and can be modified using [Rasters Validation and Sampling](./interactive%20tools/dialog_raster_validations.md). The default value for this raster list, prior to user modification, is the visible rasters in the QGIS project.

### LoS Sampling Strategy

For tools [Create Global LoS](./tools/LoS%20Creation/tool_create_global_los.md), [Create Local LoS](./tools/LoS%20Creation/tool_create_local_los.md), and [Create No Target LoS](./tools/LoS%20Creation/tool_create_notarget_los.md), the LoS is determined by **sampling distance**, which specifies how often a point is placed on the LoS, and optionally by **maximal LoS length**.
For the tools [Create Global LoS](./tools/LoS%20Creation/tool_create_global_los.md) and [Create Local LoS](./tools/LoS%20Creation/tool_create_local_los.md), the LoS is determined by the **sampling distance**, which specifies how often a point is placed on the LoS.

The tool [Create No Target LoS](./tools/LoS%20Creation/tool_create_notarget_los.md) parametrizes LoS using a **sampling distance - distance table**. This approach is significantly more flexible, as it allows the sampling distance to change based on the distance from the observer. The table is the output of the tool [LoS without Target Sampling Settings](./interactive%20tools/dialog_los_without_target_sampling_settings.md). Each row specifies the distance from which a specific sampling size should be used.

The tool [Create No Target LoS V2](./tools/LoS%20Creation/tool_create_notarget_los_v2.md) parametrizes LoS by a so-called **Sampling distance - distance table**. This approach is significantly more flexible, as it allows the sampling distance to change based on the distance from the observer. The table is the output of the tools [Calculate Object Distances](tools/Calculate%20Parameters%20Settings/tool_distances_for_sizes.md) and [Calculate Object Sizes](tools/Calculate%20Parameters%20Settings/tool_sizes_at_distances.md). Each row specifies the distance from which a specific sampling size should be used. For example, a row with column values of __Distance (meters)__ 1000 and __Size of object (meters)__ 1.754 specifies that a sampling distance of 1.754 meters should be used on the LoS when the length exceeds 1000 meters. The maximal length of the LoS is given by the maximal value of __Distance (meters)__.
For example, a row with column values of __Distance (meters)__ 1000 and __Size of object (meters)__ 1.754 specifies that a sampling distance of 1.754 meters should be used on the LoS when the length exceeds 1000 meters. The maximal length of the LoS is given by the maximal value of __Distance (meters)__. There can be two special rows in the table with values of __Distance (meters)__ 0 and -1. A row with a value of 0 specifies the sampling distance for distances smaller than the smallest provided distance (default value is 1). A row with a value of -1 means that there is no maximal LoS length and that the limit is provided by the raster data extent.

There can be two special rows in the table with values of __Distance (meters)__ 0 and -1. A row with a value of 0 specifies the sampling distance for distances smaller than the smallest provided distance (default value is 1). A row with a value of -1 means that there is no maximal LoS length and that the limit is provided by the raster data extent.
For the [Create LoS No Target Tool](./interactive%20tools/tool_los_without_target.md), the **sampling distance - distance table** is obtained from the plugin itself and can be modified using [LoS without Target Sampling Settings](./interactive%20tools/dialog_los_without_target_sampling_settings.md).

## Citation

Expand Down

0 comments on commit 98a668c

Please sign in to comment.