Isopollen Maps and how to prepare data
for the creation of isopollen maps
(as well as movie),
in cooperation with the POLPAL team: Adam Walanus & Dorota Nalepka ( firstname.lastname@example.org or D.Nalepka@botany.pl ) Home
The system is designed to produce hundreds of maps.
Data for maps have as simple form as possible. It is the MS Excel spreadsheet. In fact, it is the text CSV file, easy to generate even in Windows Notepad. See example.
Spreadsheet, like one presented below, can contain arbitrarily many sites (in columns), as well as arbitrarily many "maps" (in rows). Site names are not necessary. Because the background map can be of arbitral shape (any geographical projection) the sites position should be defined by its coordinates on the figure (bitmap, in pixels), rather than the geographic ones. How to get that coordinates is shown below. Starting with the row 7, the map identifiers are in two first columns, and then are data for the map – it is one number per site (% pollen) which generate the map. It is possible to create a single map, for data from the single row.
Background map is a monochrome bitmap of size of order of 2000x2000 pixels (rather not less than 1000, and not more than 3000). See example.
In the figure below presented is the way, how to get coordinates of sites to be placed in the CSV spreadsheet.
If the isopollen maps are to be generated for the region within some boundary, like most of maps presented above, the additional bitmap is necessary. It may be called "area map" (see example). That bitmap is to be of the size identical to that of the main background map (the figure below is 50% zoomed down for the space saving). It is the monochrome bitmap, as well. The area to be filled with isolines is simply to be black, while the surrounding area is to be white. It is rather easy to create such a map starting with the main map.
The colors for the maps are defined with the small bitmap (see example). To each map or group of maps the separate set of colors may be defined (as separate bmp files).
Isolines visualized by colors described above are defined by the strict values (of % pollen). That data have a simple form of piece of text to be placed in the e-mail. Do not change the ig1= symbols, modify only the numbers behind the = mark. The number of isolines (boundaries, here is 10) is arbitral, may be less, may be more (ig11= ig12= ...).
Exemplary: map, and data. Additional data: area map, and colors.
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