The intention of this assignment was to make 3 data frames with the top map making the lake the main focus and the bottom map making the lake not a focus at all.
Sooo… this is my trail map. Has anyone actually taken this trail?
Creating a Shapefile
- Arc Catalogue
- Create a new folder of select the folder where u wish to store the shapefile
- Right click on folder, select new shapefile
- Select the feature type and name the file, click ok. your blank shapefile is now created
Geo -Referencing
- Load appropriate map layers
- Load scanned map image
- Choose 4 points on the map, record coordinates
- Use the XY tool and make 4 points using the coordinates you just took down
- Bring up the Geo-Referencing toolbar and click “fit to display”
- Use the “add c0ntrol points” and match up the map as best u can, clicking on the scanned image then the map. match up the map using easily identified areas such as road and street junctions.
- Delete the points with the greatest residual error value as u add points until map is accurately matched up
Digitizing
- Once your image is geo-referenced, click the editing toolbar, start editing, pick the shapefile you have just created
- “sketch” the areas that you would like to digitize
- when you are done, right click and save edits
- Remove the scanned image from layers and bring up the shapefile you have just created,this shapefile should represent the image you just digitized
Uses a 3D spherical surface to define locations on earth. A point is references to by its latitude and longitude values. The origin is defined where the equator and prime meridian intersect. The globe is then devided into 4 geographical quadrants. A locations can be found based on a compass bearing from the origin.
Longitude and latitude values are defined in degrees, minutes, and seconds. (DMS)
Latitude values are measured relative to the equator and range from -90 degrees at South Pole to 90 degrees at the North Pole.
Longitude values are measured relative to the Prime Meridian. They range from -180 when travelling west to 180 degrees when travelling east.
A 2-dimentional system in which a point on a plane is determined by a distance from the origin and an angle from a fixed direction.
The origin is called the pole, the ray from the pole is called the polar axis. The distance from the pole is called the radius, and the angle is the azimuth,
Grid North: A navigational term referring to the northward direction alond the grid lines of a map. It is contrasted with True North(direction of the North Pole) and Magnetic North.
True North: The direction along the earths surface towards the geographic north pole. The direction is marked in the skies by the “Celestial North Pole”. For most practical purposes, this is the north star, or Polaris.
Specifies each point by a pair of numerical coordinates. These coordinates are the distances from the origin of the 2 fixed perpendicular directed lines, called the coordinate axis.
In my newest map i labeled all the contour lines and street names. Also i distinguished the difference between the paved and unpaved roads in the area. The map covers the main fraser lake area, with the key map covering a larger area in hillshade. I chose colors that stood out to my eyes. There really is no practical application of my map that i could think of haha
Based on our previous dicussion, there are 2 main issues that presesnt themselves when we compare data at 1:250 000 to 1:50 000:
Scale and resolution – The ability to distiguish small differences will be much more difficult when comparing at these scales, not very precise
Coverage and completeness – This could also be an issue as the whole spatial area on the 1:250 000 map cannot be seen on the 1:50 000 map
