Started on the report

documentation/report.md

@@ -1,7 +1,13 @@
 ## Group: Trygve and Esther
-# What problem will you be working on in your programming project? 
-We will be implementing a marching squares algorithm to produce a contour map from a heightmap image file.
-
+# Functionality
+Our program usees the marching squares algorithm to create a vector contour map from a raster heightmap.
+The cli interface is `gdal_contour [OPTIONS] <src_filename> <dst_filename>` with these options:
+```
+-i <elevation intervall>    Interval between contours
+-f <format>                 Fileformat to output
+```
+# data structure and input/output
+![](ER_diagram.svg)
 # Responsibilities:
 Esther will create the algorithm itself with multitreading. This will essentially be a function that takes a grid of pixels as input and returns a similar grid of cells.
 Trygve will take care of reading in the tiff file into our own datastructure and creating a vector image from the output of the algorithm.
@@ -9,6 +15,3 @@ Trygve will take care of reading in the tiff file into our own datastructure and
 # How do you plan to make it easily verifiable that your objectives are reached?
 We can compare against the `gdal_contour` cli program which is a implementation widely used in other software. We can compare speed, memory usage and the result itself.
 Each step in our program also produces a output which we can be worked on and evaluated independently.
-
-# ER diagram:
-![](ER_diagram.svg)