Last modified by Tuan Le on 2019/05/28 10:36
<
From version < 12.1 >
edited by Wai-Tim Ng
on 2018/08/29 14:27
To version < 13.1 >
edited by Wai-Tim Ng
on 2018/08/29 14:32
>
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -10,7 +10,7 @@
10 10  * Sen2cor
11 11  
12 12  (% cellpadding="5" cellspacing="5" style="height:172px; width:1284px" %)
13 -|The** band calculator **can be used to do simple arithmetic or band math between different raster layers. Operations such as caluculating vegetation indices can be perfomed by executing the corresponding formula.
13 +|The** band calculator **can be used to do simple arithmetic or band math between different raster layers. Operations such as caluculating vegetation indices can be perfomed by executing the corresponding formula.
14 14  |**Band subsetting **can be used to select bands from within the datacube. When requiring only a true color composite the function will retrieve only the red, green and blue bands inorder to reduce unnecessary data download and storage.
15 15  |(((
16 16  **Cloud masking** is the action of removing cloud affected pixels, usually by assiging NA values to them. Generally, the precense of clouds or shadows is unavoidable for optical remote sensing and result in missing data. Therefore, negatively affected pixels need to be bemoved, either manually or by applying fully automated setups. To do so cloud mask being produced using a wide range of algorithms, with different ranges of success in detecting clouds and shadows.
... ... @@ -29,6 +29,7 @@
29 29  
30 30  Vuolo, F., Ng, W., Atzberger, C., 2017. Smoothing and gap-filling of high resolution multi-spectral time series: Example of Landsat data. Int. J. Appl. Earth Obs. Geoinformationon 57, 202–213.
31 31  )))
32 +|**Re-projecting **implies transforming the output to a different [[map projection>>https://en.wikipedia.org/wiki/Map_projection]]
32 32  |**Re-sampling** is a broader term where we have data at one resolution, and need values at another (also called scaling). In case we have values at a 100 m x 100 m grid and need values at a 10 m x 10 m grid, the original values will be reused many times, and may be be simply assigned to the nearest high resolution grid cells ("nearest neighbor"), or may be interpolated somehow (e.g. by bilinear interpolation). Resampling from finer to coarser grid by nearest neighbor may again be a special case of aggregation.
33 33  |(((
34 34  [[**Sen2Cor **>>http://step.esa.int/main/third-party-plugins-2/sen2cor/]]is a Level-2A processor which main purpose is to correct single-date Sentinel-2 Level-1C Top-Of-Atmosphere (TOA) products from the effects of the atmosphere in order to deliver a Level-2A Bottom-Of-Atmosphere (BOA) reflectance product. Additional [[outputs >>doc:2\. Terminology.3\.4\. data processing levels.Sentinel-2 Level-2 products.WebHome]]are an Aerosol Optical Thickness (AOT) map, a Water Vapour (WV) map and a Scene Classification (SCL) map with Quality Indicators for cloud and snow probabilities.