Interactive imagesPeriod and cell of a regular cube
Period and cell of a regular cube
The grid a regular cube agrees on: the tiles in their projection, the region as cells, one cell over the pixels of the bands, and the intervals of the period.
Choose the period and the cell size of sits_regularize() and see the cells of each tile, the pixels under one cell and the intervals of the timeline change.
EPSG:32720 · WGS 84 / UTM zone 20S
20LKP 372 × 200 · 20LLP 256 × 200 cells of 40 m
This figure draws its pictures from regularize-run-p16d-20m-20lkp.png (2.2 MB), regularize-run-p16d-20m-20llp.png (1.5 MB), cube-regular-20lkp.png (314 kB), cube-regular-20llp.png (259 kB), regularize-run-p16d-80m-20lkp.png (66 kB) and regularize-run-p16d-80m-20llp.png (55 kB), with JavaScript.
- 40 m cell
- 10 m pixels: B02
- 20 m pixels: B8A and B11
- an image in an interval
- outside the timeline
cube_view(extent = list(<tile ∩ roi>, t0 = date, t1 = date),
srs = "EPSG:32720",
dt = "P16D", dx = 40, dy = 40,
aggregation = "first", resampling = "bilinear")cube_view(
extent = list(<tile ∩ roi>, t0 = date, t1 = date),
srs = "EPSG:32720",
dt = "P16D", dx = 40, dy = 40,
aggregation = "first", resampling = "bilinear")20LKP 372 × 200 and 20LLP 256 × 200 cells · 4 dates from 3 Jul 2018
What to try
- Make the cell larger. Press a larger cell size: each tile has fewer cells, the picture of the region coarsens, and more pixels of each band lie under one cell.
- Watch where a cell falls. In the enlarged cell, the dashed lines are the edges of the coarser pixels. At some cell sizes a tile’s cells sit on them; at others they fall between them.
- Change the period. A shorter period cuts more intervals; a period of months starts the timeline on the first of the month. The images before the timeline stay outside it whatever the period.