Lapse Rate Based Temperature Interpolation
- Author: O.Conrad (c) 2024
- Menu: Climate and Weather | Temperature
Description
The Lapse Rate Based Temperature Interpolation is quite simple, but might perform well for mountainous regions, where the altitudinal gradient is the main driver for local temperature variation. First, a given lapse rate is used to estimate sea level temperatures from elevation and temperature data at a coarse resolution. Second, the same lapse rate is used to estimate the terrain surface temperature using higher resoluted elevation data and the spline interpolated sea level temperatures from the previous step. The lapse rates can be defined as one constant value valid for the whole area of interest, or as varying value as defined by an additional input grid. Alternatively a constant lapse rate can be estimated from the coarse resolution input with a regression analysis.
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Observations | shapes, input | POINTS | - | - |
| Elevation | grid, input | DEM | - | - |
| Output | Temperature | grid, output | TEMPERATURE | - | - |
| Sea Level Temperature | grid, output, optional | SLT | - | - |
| Regression Summary | table, output, optional | REGRS_SUMMARY | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Temperature | table field | FIELD_T | - | - |
| Elevation | table field | FIELD_Z | - | - |
| Interpolation | choice | INTERPOLATION | - | Available Choices:
[0] Multilevel B-Spline Interpolation
[1] Inverse Distance Weighted
Default: 0 |
| Power | floating point number | IDW_POWER | - | Default: 2.000000 |
| Lapse Rate | choice | LAPSE_METHOD | - | Available Choices:
[0] user defined lapse rate
[1] lapse rate from regression
Default: 1 |
| Regression | choice | REGRS_LAPSE | - | Available Choices:
[0] elevation
[1] elevation and position
[2] elevation and position (2nd order polynom)
Default: 1 |
| Limit Minimum Lapse Rate | boolean | LIMIT_LAPSE | If set, lapse rates from regression are limited to a minimum as specified by the constant lapse rate parameter. | Default: 0 |
| Constant Lapse Rate | floating point number | CONST_LAPSE | Constant lapse rate in degree of temperature per 100 meter. | Default: 0.600000 |
Command Line
Usage: saga_cmd climate_tools 32 [-POINTS ] [-DEM ] [-TEMPERATURE ] [-SLT ] [-FIELD_T ] [-FIELD_Z ] [-INTERPOLATION ] [-IDW_POWER ] [-LAPSE_METHOD ] [-REGRS_SUMMARY ] [-REGRS_LAPSE ] [-LIMIT_LAPSE ] [-CONST_LAPSE ]
-POINTS: Observations
shapes, input
-DEM: Elevation
grid, input
-TEMPERATURE: Temperature
grid, output
-SLT: Sea Level Temperature
grid, output, optional
-FIELD_T: Temperature
table field
-FIELD_Z: Elevation
table field
-INTERPOLATION: Interpolation
choice
Available Choices:
[0] Multilevel B-Spline Interpolation
[1] Inverse Distance Weighted
Default: 0
-IDW_POWER: Power
floating point number
Default: 2.000000
-LAPSE_METHOD: Lapse Rate
choice
Available Choices:
[0] user defined lapse rate
[1] lapse rate from regression
Default: 1
-REGRS_SUMMARY: Regression Summary
table, output, optional
-REGRS_LAPSE: Regression
choice
Available Choices:
[0] elevation
[1] elevation and position
[2] elevation and position (2nd order polynom)
Default: 1
-LIMIT_LAPSE: Limit Minimum Lapse Rate
boolean
Default: 0
-CONST_LAPSE: Constant Lapse Rate
floating point number
Default: 0.600000