Thursday, May 21, 2009

Replace Mount Targus Tripod

GIS Exercise 2: small QGIS project


In the second exercise, we should create a small QGIS project should have the specific properties and content. Basis represents the topographic map 100 of Rheinland-Pfalz dar. It should be placed several Layer. The administrative boundaries of the districts, unitary councils and local congregations. Finally, a layer should be created with the reserves. The borders of the different administrative boundaries should be consistent with different line width and color are represented. Local communities and protected areas should be marked in appropriate color.
Another benefit should still be zoomed to the local church Weilerbach and a picture of the local community can be created.
The release of QGIS file and the image of Weilerbach was on CD.

After starting QGIS, you must first click on "New Project". The project title should be "Übung_2_ (last name) _ (first name)" for example.
hit The first thing in his new project a few settings: The map units must be in "feet" are provided and the coordinate system must be placed on Gauss-Kruger zone 2. To get into the menu for the preset you have to Settings and then click Project Settings. The map units are then set under "General", the coordinate system under "Coordinate Reference System (KBS) is selected.

project properties:


order now choose to download the map with it, the project is the button "Raster Layer Add "and in the opening menu to select the layer (in this case the card TK100_RLP located in the. tif is format).
The layer with the administrative boundaries and the nature reserves are on the button" vector layer to add selected "in the QGIS project added. The individual cards I added in succession. For the different cards I created in the legend groups. But you have only a right click in the legend and click on "New Group". I created a group on topographic maps RLP "under I ranks the TK100_RLP. I notified the card in "Topographic Map of 100" to. Next, I created a group for the Administrative boundaries under which I ordered the local communities, municipalities and the Association of Counties. The individual layers to be exactly what I called. As the last group, I created "nature reserves RLP" I class it among the layer with the reserves.
Next I took care of the required layer properties. This I did in the legend for the layer that I wanted to edit just right click and chose "Properties". In the opening menu, I chose the "representation" at the border style, border color and border width set. In the counties and the association communities, I left it at these settings. In local communities and the reserves, I made a few more settings. In local communities, I am still clicked in the box labeled "Check the checkbox to" Show labels on "set. In the Description field, I then had to "NAME" menu. After clicking Apply, have also been shown the names of the local communities. The font size I chose a font size 14 and the font color I chose the same color with which I had outlined in the local communities. With the same approach I made the show the name of the protected area. Only the description field you had here, "GEBIETSNAM" option. In the "View" I selected in the reserves also have a fill color (the same color as the outline and the inscription of the nature reserve) and a fill (BDiagonal). The border width should be different in the three administrative layers. I chose it for the edge width 3 for the counties, border width 2 for the Association of Municipalities and a border width for the local communities, because everything is so beautifully clear, though, switching to the particular zoom level. The protected areas should also be presented with a border width 3.

Layer properties: "display"

Layer Features: "Labels"


Finally, I took care not to change the order of the different layer groups in the legend. The topographical map I placed all the way down, because it is the map. Furthermore, I positioned the administrative borders with a hierarchical order: Local communities - Association of Municipalities - Counties (from bottom to top in the legend). So you can always just click on the desired layer.

Legend:


So you can also view all layers at the same time, I put in the Layer properties of the administrative boundaries still display the transparency. I challenged them each to 40 percent. In the reserves I placed a no transparency because they are in the legend at the top are and thus can be shown always (the color is also so strong). Should I add more layers, I would set the protected areas is also transparent, in this case, this is not absolutely necessary.
As a final point, I zoomed in my practice nor to the local community Weilerbach (to 1:50 000). Selected from all layers and save the image as I in the program to "File" then "Save Image As ..." to clicked. The image was as. png file.

activates all the layers:
- Protected Areas
- Local communities
- Association of Municipalities
- Counties
- Topographic Map 100


The QGIS file and the png. image file from Weilerbach I burned to a CD that I gave then.


more images from Weilerbach On / Off by different layers:

Layer
activated - Local communities
- Protected Areas
- Topographic Map 100

activated Layer:
- Local communities
- Association of Municipalities
- Protected Areas
- Topographic Map 100


result
enabled all layers
Fill the vector layer disabled


Wednesday, May 13, 2009

Bowling Phoenix Price

Welcome Plaza

Here is a sneak preview of my Disneyland Canada map - it shows the entrance area called the Welcome Plaza. It will be a huge park with fountains and flowers. Everything is fenced in by these two powerful waterfalls.

Friday, May 1, 2009

Crisco Shortening As Moisturizer

GIS Exercise 1: GIS and coordinate systems using the example of Gauss-Krüger system (GK) system

first What is an ellipsoid?

- Ellipsoid = higher-dimensional equivalent of an ellipse

- three-dimensional shape whose surface can be described mathematically

à coordinates can be given for the positions on the surface



2. What is the name of the ellipsoid used in the GK system?

Bessel or Krassowskiellipsoid

third What is the difference between geographic and projected Cartesian coordinates?

Cartesian, projisziertes coordinate system:

- is orthogonal coordinate system

- is used in two-and three-dimensional space à geometrical facts describe

- coordinates (points in space) can be expressed in terms of two and three mutually orthogonal axes


geographical coordinates:

- point on the earth's surface can be on latitude, longitude and ellipsoidal height describe


4th Which projection is based on the Gauss-Krüger system? (Short explanation)

- GK system = transverse Mercator projection

- Based on the Bessel ellipsoid Georeferenzmodell


5th What advantages does a Cartesian coordinate system?

- rectangular axes

- easy description of geometric shapes and figures

- geometric problems solvable computationally


6th Which units are to GK coordinates?

X and Y values are specified in the GK system in meters.

X value = distance from the equator to the length faithfully depicted the central meridian to Ordinatenfußpunkt

Y value = distance from the central meridian to the point


7th What is in this context, the term "Meridian"?

- Latin for "vicious Meridianus" = lunch circle

- half longitude on Earth's surface

- runs from one pole to the other

- is the connecting line of all geographic locations where the sun at the same time the highest point of their day career in the sky occupies

- all points with the same longitude are on the same meridian

- length of a meridian on the WGS84 Referensellipsoid about 20003.9 km

- certain meridians limit the time zones where the earth is divided

8th Why are used in the GK system called meridian strip?

- Around the World in 3 ° (or 6 °) wide strips split

- to represent the earth with as little distortion


9th How to recognize the code used in the GK-strip to a coordinate?

- The code is derived from the classic definition of the integer multiples of 3 ° for the central meridian (0 °, 3 °, 6 ,...):

ratio = (0 °, 3 °, 6 °, ..., 351 °, 354 °, 357 °) / 3

- The code is the law of value (y value) written above the Gauss-Krüger coordinates.

10th Which formula can be the easiest of the central meridian of any GK-strip charge?

code * 3 ° (or * 6 °) (applies to a band of 1 to 59)

120 - code * 3 ° (or * 6 °) (effective strip 60)


11th They translate the terms "Easting" and "Northing" in the current context.

"Easting = Easting

" Northing = Northing


12th What is meant by the term "False Easting and False Northing"?

"False Easting" = fixed Easting

(northern hemisphere: 500 000 m)

(southern hemisphere: 500 000 m)


"False Northing" = fixed high value

(northern hemisphere: 0)

(southern hemisphere: 10 000 m)


13th If False Easting and False Northing "used in the GK system? (Why? Or why not?)

Since Germany is in the northern hemisphere, is only "false easting" needs of 500,000, but not a "false northing".


14th Explain briefly the letters 'OGC', "SRS" and "EPSG code.

OGC = Open Geospatial Consortium

The Open Geospatial Consortium (OGC) is a 1994 founded, renamed (formerly the Open GIS Consortium) in 2004, consolidation of all relevant GIS vendors, GIS users (authorities, companies) and organizations that has set itself the goal of to improve the use of GIS and spatial data by establishing standards.


SRS Spatial Reference System

The spatial reference system (English spatial reference system , SRS) is the sum of Definitions (Coordinate system, control points, leaf sections) that orchestrate the scheme of the reference location of spatial objects in a GIS. The spatial reference system (SRS) can be specified by a mathematical formula. In the context of the OGC all SRS in the EPSG syntax (European Petroleum Survey Group) are encoded.


EPSG codes

EPSG (European Petroleum Survey Group)

system of globally unique 4 - to 5-digit codes for coordinate reference systems


15th Which "EPSG codes" are used in Germany (when using the GK system)?

for GK 2 31 466

31 467 for GK 3

31 468 for GK 4

31 469 for GK 5