File:Capri sights terrain.svg
Original file (SVG file, nominally 512 × 282 pixels, file size: 757 KB)
Captions
Summary[edit]
DescriptionCapri sights terrain.svg |
English: Version of File:Capri sights.svg with SRTM 3 terrain overlay. This SVG is not meant for direct display on Wikipedia, but uploaded here for archival purposes. (Rsvg does not properly align the terrain layer; use the PNG instead or open this file with Inkscape, layers are correctly aligned there. Please note that Firefox up to at least v3.6 also does not render this SVG right.) |
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Date | ||||
Source | Own work | |||
Author |
Morn the Gorn compass rose from Maps_template-fr.svg: Eric Gaba (Sting - fr:Sting) Road and rail data from OpenStreetMap |
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Other versions |
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Code[edit]
Terrain shading layer was generated with the following Python script (requires Python Imaging Library and NumPy):
# Read SRTM3 file and create shaded relief
# 2010-04-05
from struct import unpack,calcsize
from numpy import *
import numpy as np
from PIL import Image
row_length = 1201 # row_length is 1201 for SRTM3 or 3601 for SRTM1
file_name = "N40E014.hgt" # from http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Eurasia/
hlim = 800 # height limit for map [m]
ref_lat = 40.55 # reference latitude
earth_eq = 6371. * 1000. * 2. * pi
x_scale = 1./360.*earth_eq*cos(ref_lat/180.*pi)/row_length
y_scale = 1./360.*earth_eq/row_length
print "1 pixel = %u * %u m" % (x_scale, y_scale)
print "factor", y_scale/x_scale
h = zeros((row_length, row_length))
f = open(file_name, 'r')
li = []
for j in range(row_length):
for i in range(row_length):
d = f.read(2)
(height,) = unpack('>h', d)
h[i,j] = height
if height < -1000:
li.append((i,j))
hmax = h.max()
h3 = zeros_like(h)
h3[:,:] = h[:,:]
print len(li), "missing data points"
def get_nei(z):
h2 = h[z[0]-1:z[0]+2,z[1]-1:z[1]+2]
nn = sum(where(h2 < -1000, 0, 1))
av = sum(where(h2 > -1000, h2, 0)) / float(nn)
return nn, av
# fill missing points with a nearest-neighbor averaging method:
loop = len(li)
lim = 7
while loop > 0:
sd = False
for q in range(len(li)):
if h[li[q]] > -1000.: continue
n, a = get_nei(li[q])
if n >= lim:
print li[q],loop, n, a, lim
h3[li[q]] = a
loop -= 1
sd = True
if not sd: lim -= 1
h[:,:] = h3[:,:]
print "missing points done"
def hext(a):
"Hex color to triplet."
r,g,b = a[0:2], a[2:4], a[4:6]
return int(r, 16), int(g, 16), int(b, 16)
# from http://en.wikipedia.org/wiki/Wikipedia:WikiProject_Maps/Conventions/Topographic_maps:
col_sea = hext("0978ab")
cols = """
{{Mapcolor|r=245|v=244|b=242|hex=#F5F4F2|col=black}}
{{Mapcolor|r=224|v=222|b=216|hex=#E0DED8|col=black}}
{{Mapcolor|r=202|v=195|b=184|hex=#CAC3B8|col=black}}
{{Mapcolor|r=186|v=174|b=154|hex=#BAAE9A|col=black}}
{{Mapcolor|r=172|v=154|b=124|hex=#AC9A7C|col=black}}
{{Mapcolor|r=170|v=135|b=83|hex=#AA8753|col=black}}
{{Mapcolor|r=185|v=152|b=90|hex=#B9985A|col=black}}
{{Mapcolor|r=195|v=167|b=107|hex=#C3A76B|col=black}}
{{Mapcolor|r=202|v=185|b=130|hex=#CAB982|col=black}}
{{Mapcolor|r=211|v=202|b=157|hex=#D3CA9D|col=black}}
{{Mapcolor|r=222|v=214|b=163|hex=#DED6A3|col=black}}
{{Mapcolor|r=232|v=225|b=182|hex=#E8E1B6|col=black}}
{{Mapcolor|r=239|v=235|b=192|hex=#EFEBC0|col=black}}
{{Mapcolor|r=225|v=228|b=181|hex=#E1E4B5|col=black}}
{{Mapcolor|r=209|v=215|b=171|hex=#D1D7AB|col=black}}
{{Mapcolor|r=189|v=204|b=150|hex=#BDCC96|col=black}}
{{Mapcolor|r=168|v=198|b=143|hex=#A8C68F|col=black}}
{{Mapcolor|r=148|v=191|b=139|hex=#94BF8B|col=black}}
{{Mapcolor|r=172|v=208|b=165|hex=#ACD0A5|col=black}}
"""
col = []
for l in cols.splitlines():
if len(l) < 10: continue
i = l.find('#')
if i > -1:
col.append(hext(l[i+1:i+7]))
col.reverse() # -> bottom to top
o = Image.new('RGB', h.shape)
def interp(c, f):
"Interpolate into color table."
r = int((1.-f) * col[c][0] + f * col[c+1][0])
g = int((1.-f) * col[c][1] + f * col[c+1][1])
b = int((1.-f) * col[c][2] + f * col[c+1][2])
return r,g,b
for j in range(row_length):
for i in range(row_length):
c, f = divmod(h[j,i] / hmax * (len(col)-1), 1)
if 0 < h[j,i] < hmax:
o.putpixel((j,i), interp(int(c), f))
elif h[i,j] == hmax:
o.putpixel((j,i), col[-1])
else: o.putpixel((j,i), col_sea)
o.save("map_height.png") # save height map
o2 = o.crop((0,0,942,603))
o2.save("map_height_cropped.png")
# taken from hillshade.py:
#def illumination(idata,azdeg=315.0,altdeg=45.):
def illumination(idata,azdeg=225.0,altdeg=45.):
# convert alt, az to radians
az = azdeg*np.pi/180.0
alt = altdeg*np.pi/180.0
# gradient in x and y directions
dx, dy = np.gradient(idata)
slope = 0.5*np.pi - np.arctan(np.hypot(dx, dy))
aspect = np.arctan2(dx, dy)
odata = np.sin(alt)*np.sin(slope) + np.cos(alt)*np.cos(slope)*np.cos(-az -\
aspect - 0.5*np.pi)
# rescale to interval -1,1
# 1 means maximum sun exposure and 0 means complete shade.
odata = (odata - odata.min())/(odata.max() - odata.min())
return odata
il = 255 * illumination(h)
o4 = Image.new('RGBA', il.shape)
for j in range(row_length-1):
for i in range(row_length-1):
v = int(il[j,i])
if 0 <= v < 128:
alpha = (255 - 2*v)
o4.putpixel((j,i), (0,0,0,alpha))
elif v == 128:
o4.putpixel((j,i), (0,0,0,0))
elif 128 < v < 256:
alpha = 2*(v-128)
o4.putpixel((j,i), (255,255,255,alpha))
else:
o4.putpixel((j,i), (255,255,255,0))
o4.save("il_NW_alpha.png") # NW-illuminated (alpha transparency for use with Inkscape)
Licensing[edit]
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:45, 2 January 2018 | 512 × 282 (757 KB) | JoKalliauer (talk | contribs) | Reverted to version 18:59, 4. Apr. 2010 https://upload.wikimedia.org/wikipedia/commons/archive/9/9e/20100405190103%21Capri_sights_terrain.svg | |
22:16, 30 September 2010 | 1,000 × 550 (924 KB) | Morn (talk | contribs) | added OpenStreetMap layer | ||
22:56, 7 April 2010 | 1,000 × 550 (826 KB) | Morn (talk | contribs) | added scale in feet | ||
18:45, 7 April 2010 | 1,000 × 550 (823 KB) | Morn (talk | contribs) | more mountains | ||
13:48, 7 April 2010 | 1,000 × 550 (819 KB) | Morn (talk | contribs) | mountain heights | ||
21:49, 6 April 2010 | 1,000 × 550 (814 KB) | Morn (talk | contribs) | Philosophical Park as area | ||
19:01, 5 April 2010 | 1,000 × 550 (812 KB) | Morn (talk | contribs) | better terrain calculation | ||
18:59, 4 April 2010 | 1,000 × 550 (818 KB) | Morn (talk | contribs) | compass rose | ||
15:45, 4 April 2010 | 1,000 × 550 (811 KB) | Morn (talk | contribs) | hypsometric colors | ||
00:33, 4 April 2010 | 1,000 × 550 (628 KB) | Morn (talk | contribs) | match sRGB color profile |
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