The algorithm of DEM processing, implemented in GDAL utility gdaldem, was used for generating multi-purpose topographic models: aspect, hillshade, roughness and topographic indices, such as Topographic Position Index (TPI), Terrain Ruggedness Index (TRI).

Data visualization highlighted high resolution and accuracy of GEBCO grid, enabling topographic modelling at the advanced level. The data were imported to GRASS GIS via r.in.gdal. Several GDAL utilities were applied for data processing: gdaldem, gdalwarp, gdalinfo, gdal_translate. The focus study area encompasses the area around Okinawa Trough, Ryukyu trench-arc system, southern Japan, East China Sea and the Philippine Sea, west Pacific Ocean. A simple blessing is in order.This paper presents using GDAL utilities and GRASS GIS for topographic analysis of the raster grids based on GEBCO DEM as NetCDF file at 15 arc-second intervals. I can confidently say that I use it with affection every day. Quick Look is burned into my mind as a Mac user. Mark up an item: Click the Markup button.Keep clicking to continue rotating the item. Rotate an item: Click the Rotate Left button or press and hold the Option key, then click the Rotate Right button.Zoom in and out of an item: Press Command-Plus (+) to make the image bigger or Command-Minus (–) to make it smaller.Resize the window: Drag the corners of the window.ESC to collapse.Īpple’s tech note has the complete list, but if you’re a tl dr minded reader, I’ll document just a few more notable functions from Apple’s list. CTRL-OPT-space bar: open in full screen.Type again to collapse or use the Close button (top left of window).

Looking at a file quickly, to inspect it, for whatever reason is a natural part of our Mac life.Īs much as I love Quick Look, I hadn’t realized that there are actually multiple ways to invoke it, beyond the space bar, until I did some reading. The tedious process of launching an app and doing a File > Open was merely the baby step of the early Mac days-before we learned how to become impressively productive. This is testimony to the fact that Quick Look has become an integral part of my, and I would guess most user’s, macOS workflows.

Apple introduced Quick Look in Mac OS X Leopard

Mac os gui interfaces cocoa