![]() Print out a document where you explain clearly for every point where and how to. Īs for the optimal number of GCPs in the stratified interior, try to aim for a density of around 0.5-1 GCP per hectare to minimise altimetry errors, and make sure to place GCPs throughout the entire altimetry-interval, e.g., covering both ridges and valleys. Ground Control Points (GCPs) are well noticeable spots with known coordinates on the ground in your area of interest. Select on the imagery (in a regular pattern) some interesting GCP points. Therefore, best accuracies are achieved (1) placing GCPs around the edge of the study area, but it is also essential to (2) place GCPs inside the area with stratified distribution to optimize vertical accuracy. Placing the GCPs around the edges and in a stratified manner throughout the survey area results in the lowest overall errors. In general, a combination of the edge and stratified distribution (d) gives rise to the lowest overall errors. In some cases (and more likely in older Landsat data), scene and/or sensor issues, or insufficient. (a) edge distribution, (b) central distribution, (c) corner distribution (equivalent for all four corners), (d) stratified distribution, (e) random distribution. Propeller recommends using one to three AeroPoints for sites up to 150 acres. Ground Control Points identify recognizable features in the input images and align them to a known location (X, Y and Z coordinates). Each Landsat scene is processed to one of the three following processing levels: Precision and Terrain Correction (L1TP) All Landsat scenes are attempted to process to L1TP, using Ground Control Points (GCPs) and a digital elevation model (DEM). 29 Five different GCP distribution types and an example for the combination of 16 GCPs (second row). AeroPoints are high-precision, smart ground control points, thoughtfully designed for drone beginners, but precise enough for survey veterans.
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