I want images to help track changes in vegetation (from farming and mining) how do I know which dataset to use? and what do you do with the data after its downloaded? Which software do you need to open them? Hope someone can help.
If I was doing a vegetation analysis, I would probably try using NDVI. Here's some background - gisgeography.com/ndvi-normalized-difference-vegetation-index/ - You're on the right track for using Landsat imagery and the USGS Explorer. The next step would be performing the analysis. The #1 open source option is QGIS, hands down. A good commercial option is ArcGIS Pro, which is a bit pricey. I've done a video on how to create an NDVI map with ArcGIS Pro. Please take a look - ua-cam.com/video/p1M2AGrFQ38/v-deo.html - I will try to get videos for QGIS in the upcoming year or two. Sorry, but I haven't done that yet.
If you're using ArcGIS, you can use the tool "Composite Bands". You add your TIFs as input and make sure they are in the order of red, green, and blue. This tool will stack these three single-band layers into a multi-band RGB image. If you don't have access to ArcGIS, you can download QGIS for free, which has most of the same tools as ArcGIS. The tool in QGIS that you want to use is "Build Virtual Raster".
Thanks for the video, short and to the point.
Hi, some images taken by the corona satellites aren’t showing the download option. Could you help me with downloading them?
I need to download Landsat 7 dataset but from usgs api. Do you know downloading from api? I use python programming language
Hey ! can't download all images at one, is that normal ? I must do one by one and it's bother me a lot.
I want images to help track changes in vegetation (from farming and mining) how do I know which dataset to use? and what do you do with the data after its downloaded? Which software do you need to open them? Hope someone can help.
If I was doing a vegetation analysis, I would probably try using NDVI. Here's some background - gisgeography.com/ndvi-normalized-difference-vegetation-index/ - You're on the right track for using Landsat imagery and the USGS Explorer. The next step would be performing the analysis. The #1 open source option is QGIS, hands down. A good commercial option is ArcGIS Pro, which is a bit pricey. I've done a video on how to create an NDVI map with ArcGIS Pro. Please take a look - ua-cam.com/video/p1M2AGrFQ38/v-deo.html - I will try to get videos for QGIS in the upcoming year or two. Sorry, but I haven't done that yet.
Thanks a Lot 👌
The .TIF files in the ones I've downloaded all display my region in various shades of gray. How does this become color?
If you're using ArcGIS, you can use the tool "Composite Bands". You add your TIFs as input and make sure they are in the order of red, green, and blue. This tool will stack these three single-band layers into a multi-band RGB image. If you don't have access to ArcGIS, you can download QGIS for free, which has most of the same tools as ArcGIS. The tool in QGIS that you want to use is "Build Virtual Raster".
I released a video that shows you how to convert the RGB bands into a true color raster - ua-cam.com/video/SwW9Bvp5XAk/v-deo.html
Hope this helps!
thank u so much!
👌