MAPresso visualizes relative data in form of choropleth maps. Using absolute data MAPresso can produce area cartograms. Here you find menu optioms as well as some hidden features.
- Selection of the mapping variable
- Select it with the popup menu.
- Identification of the value of an areal unit
- Moving the cursor over the map displays the areal unit name and its variable value in a text field (beside the variable popup menu).
A mouse click in an areal unit shows a window containing all variable values of this area.
- Hidden feature
- Moving the cursor over the legend area shows additional shortcuts (cf. below).
- Generate EPS Code...
- In a window you get EPS code (extended PostScript). This code can be copied via the clipboard into a text file. This EPS file (extension: .eps) can be integrated as a graphic element into a text processing program and printed on a PostScript printer. The file can also be visualized by a PostScript interpreter (e.g. GhostScript). Details.
- Write Geometry to Console
- Enter Data...
- Here you can paste your own data into a text area. The format: first line: variable names (several variables are separated by tabulators), remaining lines: the data values. Important: the data values must be in the correct sequence (in the same order as the areal units). Colors etc. were taken from the actual selected map (but not the class boundaries). Details.
- Reload Data
- If updated data is available on the server or if you filtered (cf. below) too much, the data is again fetched from the server.
- Different univariate statistical measures (mean, median, standard deviation, variation coefficient, number of values) and the correlation coefficients between the variables are shown.
- 1 Color Range
- 2 Color Ranges
- Change between the two color schemes: one color range or two ranges.
- Nominal Values
- For classified values: each class gets a distinct color.
- Class Breaks...
- Enter the 2 respectively 3 class breaks. Between the upper and the lower boundary there is a continuous color transition (with an eventual change at the middle boundary).
- Swap Colors
- Bi-/Trivariate map
- 2/3 variable popup menus allow the simultaneous visualization of 2 or 3 variables. In the case of bivariate maps the first variable corresponds to the x axis of the color square, the second variable to the y axis. Clicking in the center of the quadratic legend swaps the two corner colors (top left and bottom right).
In the case of trivariate maps the three primary colors are mixed either in an additive way ( RGB ; red, green and blue correspond to the 3 variables: white means high values in all variables, dark colors mean low values) or in an subtractive way ( CYM ; cyan, yellow, magenta correspond to the 3 variables: white means low values in all variables, dark colors mean high values).
Clicking in the center of the triangular legend switches between the two color schemes. Clicking at the sides swaps the two adjacent colors.
- Color Scheme ...
- Attach a color scheme from (this) list.
- Maximum... / Top... / ...
- Select the various colors determining the appearance of the map (the same can be achieved by clicking on the corresponding parts of the legend).
- (specific Geometry files)
- Select on of the listed geometries.
- Area Cartogram...
- Using the selected variable - it must be absolute values - the map base is distorted in such a way that the size of the area of the areal units corresponds to the variable value (the weight of the areal unit).
- Zoom Tools
- Reset Zoom
- Reset Zoom
- Polygon Labels
- version, author.
- MAPresso Web Site
- opens in the predefined browser.
- this page.
- Small yellow windows should appear near an areal units and show its name and data value. However, this option doesn't work with several browsers.
- A simple generalizing filter is applied to the thematic variable and smoothes random noise on the map. This Marcov process is based on the followin idea: assuming population data, a part of the persons remain in their areal unit, the others emigrate into the neighbour polygons (the number is proportional to the length of the common boundary). With an increasing number of filtering steps the statistical surface gets more and more generalized.
- Reset Data
- After a inadequate generalization you can get back the original data.
- The histogram is drawn using a kernel density function. Clicking on "a" shows more detail, clicking on "b" generates a more generalized histogram.
- more/less decimal places.
- Displays the data value corresponding to this color.
- Modification of the colors.
- Modification of the background color / missing value color.
Nominal legend: click below the legend to randomly change colors of values without an explicitly defined color.