Hi PyEphem developers.
I've checked the documentation but cause of me is not astronomy specialist I was unable to find and answer, do PyEphem can help me to find a time when specific constellation is in its zenith position for specific date and place on Earth? I need to calculate times for entire year…
Thanks.
I think you are looking for transit time
see the pyephem doc here
http://rhodesmill.org/pyephem/rise-set.html#
the stars are catalogued in the src directory in file
stars.py
you can add stars to the catalog see: readdb and note the caveats
http://rhodesmill.org/pyephem/tutorial.html#fixed-objects-precession-and-epochs
Related
I want to make a network graph which shows the distribution of our documents in our folder structure.
I have the nodefile, edgefile and gephi graph file in this location:
https://1drv.ms/f/s!AuVfRBdVHkO7hgs5K9r9f7jBBAUH
What I do is:
Run the algorithm ForceAtlas2 with scaling 10-20, dissuade hub marked and prevent overlap marked, all other standard setting.
What I get is a graph with groups radial/spherical distributed. However, what I want is a tree directed network graph.
Anyone know how I can adjust Gephi to make this?
Thanks!
I just found a solution.
I tested the file format as shown on the Yed site "import excel file" page
http://yed.yworks.com/support/manual/import_excel.html
This gave me the Yed import dialog (took a life time to figure out that it's a pop up menu and not selectable through the standard menu)
Anyway, it worked and I've adjusted the test files with the data prepared for the Gehpi. This was pretty easy, I could used the source target ID's etc. Just copy paste.
I load it into Yed and used some directed and radial clustering algorithms on it. Works fine!
Below you can find the excel node/edge file used to import in Yed and the graph file you can open with Yed to see the final radial result.
https://1drv.ms/f/s!AuVfRBdVHkO7hg6DExK_eVkm5_mR
Only thing to figure out is how to combine the weight (which represents the number of documents) with the node size.
Unfortunately, as of version 0.9.0, Gephi no longer supports hierarchical graphs. Maybe try using a previous version?
Other alternatives involve more complex software, such as Graphviz, but you need a .dot file instead of your .csv. I looked all over, but could not find an easy-to-use csv to dot converter.
You could try looking at d3-hierarchy, a node.js program, but then again you need to use the not-so-user-friendly npm. If you look at the link, it looks like it can produce the kind of diagram you're looking for.
I was wondering if there is a way to get the highway direction of the route.
To be more specific, I am interested in routes on interstate highways in the United States only.
I'll give an example:
Interstate I45 is a north-south highway. When the route is returned, is there a way to know which "direction lane" the route is on?
The problem I'm trying to solve is accessing the rest ares like the one shown on the image here. As you can see, these are two rest areas, each accessible from one direction of the highway.
I would like to display only those accessible from the direction the user is on. I have all the data needed, including if the rest area is on the North/South/East/West direction and I only need the highway direction the route is on.
For obvious reasons, I would like to avoid manually checking if the route just appears to be going northwards.
I checked if this is possible via graphhopper, but it only gives the highway name, without direction. Is it possible to achieve this via Skobbler?
If you are using the TTS instructions (text-to-speech) then in the advice instructions & audio advices you will also receive the "orientation" (coded as a $orientation in the audio config files) - indicating the direction you are driving on a particular highway (south/north, etc.).
The trickier part is that you would have to parse the text instruction to get this information as it's not returned in a separate field (let me know in a comment if this was helpful).
I do not fully understand the original problem but as GraphHopper also returns the geometry for every instruction you should be able to calculate the orientation roughly but easily.
Another more complex approach would be to have a predefined name set associated with the geometry and use the map matching component to find out which highway parts are used in a route.
For obvious reasons,
which obvious reasons? That it is not really going norht south?
Or if something is not possible you always can modify in the code as it is open source or provide a pull request to merge it into the public release (if useful for others) and make it available for the Directions API too.
According to the OSM wiki page Highway Directions In The United States, directions of ways are supposed to be modeled as relation membership roles.
For example, I 75 way 173483918 is a member of the relation 332618 named "I 75 (TN northbound)" with role=north, so it's direction is "north".
The opposite way 173483897 is a member of the relation 332624 named "I 75 (TN southbound)" as role "south".
See more details on the wiki page. Don't know how well established that tagging scheme is, also don't know about router support (Telenav (Scout) seem to be involved in this who now own Skobbler).
I need help trying to find a utility or method to search for annotations (filled rectangles) in tiff files and determine their coordinates. I'm not a programmer, but I'm profficient with vbscript and powershell....any suggestions would be greatly appreciated.
I'm not very familiar with the TIFF specification as you can probably tell....i've downloaded the specs from adobe, but can't make heads or tails of what i need.
i have looked at the following related post:
Tiff annotations
it suggested looking at:
http://web.archive.org/web/20030124024322/http://www5.eistream.com/support_pro/faqs/annospec.htm
which says that annotations are referenced in tag 32932....however, i've used libtiff.org's tiffinfo.exe to view the tags associated with a test file (that has an annotation).....it does not show tag 32932.
so that's where I'm at. again thanks in advance.
From the Postgresql documentation:
int cursorOptions
Integer bit mask of cursor options; zero produces default behavior.
What is the default behavior? Where is a complete list of cursor options? I've been looking through the documentation for an hour now. Can someone provide a link or point me in the right direction?
I am compiling a list of cursorOptions as I peel through the documentation to help save the others the trouble.
Defined in <src/include/nodes/parsenodes.h>:
CURSOR_OPT_BINARY (0x0001)
CURSOR_OPT_SCROLL (0x0002) is required by several SPI commands. Setting this option will allow for more complex movement through cursors. Further details are explained in the documentation of SPI_cursor_fetch, SPI_cursor_move, SPI_scroll_cursor_fetch, SPI_scroll_cursor_move
CURSOR_OPT_NO_SCROLL (0x0004)
CURSOR_OPT_INSENSITIVE (0x0008)
CURSOR_OPT_HOLD (0x0010) is ignored by SPI_prepare_cursor. However, it's behavior for SPI_prepare_params and SPI_cursor_open_with_args is not specified in the documentation.
CURSOR_OPT_CUSTOM_PLAN (0x0020)
CURSOR_OPT_FAST_PLAN (0x0040)
CURSOR_OPT_GENERIC_PLAN (0x0080)
NOTE: If anyone with the ability to edit posts wishes to contribute to this answer (additional options, functionality or insights), please feel free to do so. I will try to move comments up into the answer as they come.
So I need a few simple pointers with the BIRT chart API.
I am trying to draw a simple line chart of a numeric value over time. I have a vector of (Date,Double) pairs as input. I have read through the examples in org.eclipse.birt.chart.examples but not yet gained enough traction with the API to start making use of it. Just composing a org.eclipse.birt.chart.model.impl.ChartWithAxesImpl has me stumped.
The eventual destination is an Eclipse editor, and that I can do. Is there a tutorial or book anyone can recommend that might get me going with the BIRT chart side?
I should be very grateful
M.
Well. There is this example: http://www.eclipse.org/articles/article.php?file=Article-BIRTChartEngine/index.html
But I am having some problems actually getting it to work myself. All I end up with is an exception like this:
java.lang.NullPointerException
at org.eclipse.birt.chart.device.swt.SwtTextMetrics.getHeight(SwtTextMetrics.java:178)
at org.eclipse.birt.chart.computation.Methods.computeFontHeight(Methods.java:1272)
at org.eclipse.birt.chart.computation.BIRTChartComputation.computeFontHeight(BIRTChartComputation.java:30)
at org.eclipse.birt.chart.computation.EllipsisHelper$SimpleTester.<init>(EllipsisHelper.java:213)
at org.eclipse.birt.chart.computation.EllipsisHelper.createSimpleTester(EllipsisHelper.java:176)
at org.eclipse.birt.chart.computation.EllipsisHelper.simpleInstance(EllipsisHelper.java:183)
at org.eclipse.birt.chart.computation.LabelLimiter.limitLabelSize(LabelLimiter.java:256)
at org.eclipse.birt.chart.computation.LabelLimiter.limitLabelSize(LabelLimiter.java:211)
at org.eclipse.birt.chart.model.layout.impl.TitleBlockImpl.computeBox(TitleBlockImpl.java:288)
at org.eclipse.birt.chart.model.layout.impl.LabelBlockImpl.getPreferredSize(LabelBlockImpl.java:266)
at org.eclipse.birt.chart.internal.layout.LayoutManager$ChartLayout.<init>(LayoutManager.java:111)
at org.eclipse.birt.chart.internal.layout.LayoutManager.doLayout_tmp(LayoutManager.java:1145)
at org.eclipse.birt.chart.internal.layout.LayoutManager.doLayout(LayoutManager.java:1310)
at org.eclipse.birt.chart.factory.Generator.build(Generator.java:1092)
I had the same trouble with the examples from org.eclipse.birt.chart.examples. There are some good java code snippets, but you do not see to what they correspond. This is why I decided to generate all the examples and put them on a web site: BIRT Charts Gallery.