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Trygve 2024-05-07 22:26:11 +02:00
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193
documentation/ER_diagram.gaphor
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% INF205 Project report
% Esther and Trygve
% 7. May 2024
## Group: Trygve and Esther
# 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.
Our program usees the marching squares algorithm to create a vector contour map from a raster heightmap (DTM).
It outputs a geojson file that can be read by gis software. [https://mapshaper.org/](https://mapshaper.org/) is a simple website where you can view geojson files.
# 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.
# data structures and input/output
![ER diagram](ER_diagram.svg)
The HeightMap class stores the heightmap as a array on the heap. It was not nececarry to copy or move this class, so we did not implement copy or move constructors/assignment operators.
The Point class represents a point in a line. The points are stored in vectors, wich are again stored in a big vector containing all the lines.
The `produce_cellmap` function finds the points for a contour at a given elevation. The `create_lines` uses `produce_cellmap` the get the points and then sorts them into contiguous lines before returning a `std::vector<std::vector<Point>>`{.cpp} thats used by the function `write_output_file` to write them to a geojson file.
# Performance
# Functionality of special interest
## Trygve
I can created a blur method that performs a simple box blur on the whole heigtmap. This is usefull to smooth out noise and create a more readable output.
I wanted to implement a gaussion blur, and the code is ready for that, but in the end we became short on time.