Dear community, hello people,
in the end of last year I already described a little bit my project and asked for some first support. Meanwhile I started working for the first time with vvvv and run into some problems… that I somehow suspected. I deeply hope that there are already possibilities to solve the problems, or maybe challenging the professionals for new programming…
I have my vvvv and text file attached. As I described earlier I have to represent scientific data from an ongoing data base. To be accurate, I will represent earthquake data, with the attributes of position (x, y, -z, as lat/long/depth), event time and magnitude (energy).
First of all, it seems that I don´t get the data georeferenced e.g. projected correctly. But this is the basis for all further visual and statistic research.
When developing the concepts, I visualized (static) a set of test data with the open source GRASS GIS, region Indonesia (jpgs attached). GRASS GIS uses for projection the geodetic datum, GDAL (raster data) and OGR (vector data) libraries and EPSG Geodetic Parameter Dataset (a structured data set of Coordinate Reference Systems and Coordinate Transformations) to represent data on the uneven shape of the earth in 2d and 3d, and allows a scale exaggeration in -z (vertical ).
Is this spacial projection possible in vvvv? And how?
After reading the data, I tried to built a chronological vector graph with the points2vector (3d) node. ( I need the cylinders to later also use its diameter and color as a variable). And the sphere node to represent the earthquake positions.
I guess that the map/map range nodes and the earth radius are not the correct projection (this solution seems not scientificly exact and updated, but moreover it does not work, the vectors (cylinders) get all messed up (when entering a value for the cylinder size). Also navigation is difficult in this scale.
In order to visualize the vector directions of the chronological graph in a single origin, with the vector tail placed in the origin (vector rose), I applied a vector translation and then used again a points2vector node.
In order to observe the changing of directions in time of the vector rose, I used the counter node to animate the vectors in chronological order (about 60 vectors visible (sum about 200 data, but later should be above 1000 data).
But how can I control the time, f.e. by changing/playing with the speed of the counter, how can I invert the time direction of the counter (going back to past) and how can I enter time intervals of the data, and insert sound (event sound)?
There are much more variables that I would like to insert, like the size of the vector diameters (cylinder), vector colors, extract statistics of vector directions in space, or add a dynamic envelope on the vector rose to better observe changes…
But the most important thing I have to resolve is the correct projection!!!
I really would appreciate help,