LECTURE-6 ... 15 November 2019

We will create points over the Cotton Yield/EC dataset and simulate water-table depth exactly like in the homework that is due 18th.

• convert coordinates: LAT/LONG data (EPSG:4326)  to projected CRS (EPSG:32617) download  LECTURE6DATA File and open in QGIS
• interpolate away variables  10 m resolution raster; for extent we use EC layer for all

1. EC(deep&shallow column),
   
2. Yield (Prod column)
   
3. GreenSeeker (RED1 and NIR1 columns)
   

• draw a polygon around the Yield points to limit study area - convex hull vs concave hull
• convert a raster to points
• Spatial relations (overlap, touches, intersects ...) - select points inside polygon (vector menu ==> research tools ==> select by location)
• use point sampling tool plugin to sample ALL rasters
• export to Excel and check correlations - R value
• draw conclusions over our data

Dataset:

•  LECTURE6DATA File
  

Tutorials:

• Interpolating Point Data
  
• Working with Attributes (QGIS3)
• Making a Map (QGIS3)
  
• Importing Spreadsheets or CSV files (QGIS3)
• Sampling Raster Data using Points or Polygons (QGIS3)