[R-sig-Geo] help with 2d- Density plots (ggplot2)

[Thierry Onkelinx]

Dear Amao,

It's not clear how the "hundreds of species" come into the play. Do you
want a map for each species? Or rather a single map that combines the
species info.

ggplot2() has AFAIK no options to restrict the output of stat_bin2d() to a
polygon.

Best regards,


ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

2016-01-15 18:00 GMT+01:00 Amao Abduljamiu <lekisoft at gmail.com>:

> Dear All,
>
> I need help with 2d- Density plots (ggplot2)...
>
> I'm trying to plot ecological distribution of some species of organisms i'm
> studying over the Arabian/Persian Gulf. Here is a sample of code i've
> tried,
>
> Backround layer
>
> nc <- get_map("Persian Gulf", zoom = 6, maptype = 'terrain', language =
> "English")
> ncmap <- ggmap(nc,  extent = "device")
>
> Other layers
>
>   ncmap+
>     stat_density2d(data=sample.data3, aes(x=long, y=lat, fill=..level..,
> alpha=..level..),geom="polygon")+
>     geom_point(data=sample.data3, aes(x=long, y=lat))+
>     geom_point(aes(x =50.626444, y = 26.044472), color="red", size = 4)+
>     scale_fill_gradient(low = "green", high = "red") + scale_alpha(range =
> c(0.00, 0.25), guide = FALSE)
>
> but , i will like to use the stat_density2d to show the distributions of
> hundreds of species (which are recorded in columns e.g SP1....SPn) over the
> water body rather than just displaying latitude and longitude.
>
> Also, is it possible to restrict my heat map to just the water body ? I'll
> appreciate any help and recommendations i can get on this please
>
> I will also appreciate any suggestion on alternative way to achieve this.
>
>
> Here is a link to stackoverflow where I initially asked the question with
> an
> image of what the problem look like.
>
>
> http://stackoverflow.com/questions/34569152/ggplot-stat-density2d-plots-for-
> ecological-distribution
>
> Sincerely
> Amao
> -------------------------------------------
> Amao Abduljamiu O.
> PhD Candidate - Geology
> Earth Sciences Department
> King Fahd University of Petroleum and Minerals (KFUPM)
> Dhahran, Saudi Arabia
> P. O. Box 1723 KFUPM, Dhahran 31261 Saudi Arabia
> Tel. office +966 3 860 3240
> Mobile: +966 535467527
> Skype: lakesido02
> Email: amao at kfupm.edu.sa
> Alt: lekisoft at gmail.com
>
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