Android: How do I set the zoom level of map view to 1 km radius around my current location?
I want to set the map view zoomed to 1km radius but cant figure out how?
The doc says that the zoom level 1 will map earths equator to 256 pixels. So how do I calcul
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Using loop to calculate zoom level is very naive. It is way long better to use math.
Here the function (return type: float)
public static double calcZoom(int visible_distance, int img_width) { // visible_distance -> in meters // img_width -> in pixels visible_distance = Math.abs(visible_distance); double equator_length = 40075016; // in meters // for an immage of 256 pixel pixel double zoom256 = Math.log(equator_length/visible_distance)/Math.log(2); // adapt the zoom to the image size int x = (int) (Math.log(img_width/256)/Math.log(2)); double zoom = zoom256 + x; return zoom; }example call:
public static void main(String[] args) { // computes the zoom for 1km=1000m for an image having 256 width double zoom = MainClass.calcZoom(1000, 256); System.out.println("zoom: " + String.valueOf(zoom)); return; }The math formulae to calculate the zoom level is:
equator_length = 40075016 zoom_level = logE(equator_length/distance)/logE(2) + logE(img_width/256)/logE(2) // The zoom_level computed here is a float number.That's all folks! :-)
ATTENTION: The solution above as the accepted answer only works for zoom levels next to the equator. If you want a solution that works with all latitudes you need the length of the parallel at the same latitude of the zoom level you want to compute. The
calcZoommethod changes toprivate double calcZoom(int visible_distance, int img_width, double atLatitude) { // visible_distance -> in meters // img_width -> in pixels double parallel_length = this.calcParallelLegth(atLatitude); // in meters // for an immage of 256 pixel pixel zoom256 = Math.log(parallel_length/visible_distance))/Math.log(2) // adapt the zoom to the image size x = (int) Math.log(img_width/256)/Math.log(2) zoom = zoom256 + x return zoom; }Where
this.calcParallelLegth(atLatitude)returs the length of the parallel at theatLatitudelatitude.You can compute the length yourself with some library (preferably using Vincenty formulae).
Alternatively
If you don't have such a library (or you don't search for a library, or you just want a complete code that works) at the bottom of this answer you can find the whole working code with an implementation of
double calcParallelLegth(double atLatitude)that uses a table (computed using Vincenty Formulae) with parallel length at all latitudes with 3% tollerance.
NOTE:
YOU NEED TO READ BELOW ONLY IF YOU AND TO UNDERSTAND THE FORMULA (OR CHECK IF THE FORMULA IS RIGHT)Formulae explanation below :
Putting it in a simple way!
Let's split the problem in two parts.
Part 1
calc the zoom for an 256x256 size imagePart 2
adapt the zoom for an image with a different sizeResolving Part 1
Image size is 256x256. Zoom level 0 shows the whole equator.
each subsequent zoom level let me see half then before.Equator is 40,075,016 meters long (according WGS-84 (*1) and Vincenty formulae (*2))
zoom=0 -> 40,075,016 / 1 = 40,075,016 meters visible Note: 2^0=1 zoom=1 -> 40,075,016 / 2 = 20,037,508 meters visible Note: 2^1=2 zoom=2 -> 40,075,016 / 4 = 10,018,754 meters visible Note: 2^2=4 zoom=3 -> 40,075,016 / 8 = 5,009,377 meters visible Note: 2^3=8 zoom=4 -> 40,075,016 / 16 = 2,504,688.5 meters visible Note: 2^4=16 zoom=5 -> 40,075,016 / 2^5 = 1,252,344.25 meters visible Note= 2^5=32 zoom=6 -> 40,075,016 / 2^6 = 636,172.125 meters visible Note= 2^6=64 ... zoom -> equator_length / 2^zoom = visible_distanceAs you can see above, each subsequent zoom level let me see half then before.
zoom is the zoom_level wanted.
visible_distance is how many meters the image shows horizontally.if you want 1km than you have to calculate zoom with visible_distance=1000
Let's find out the zoom formulae.
Here is where math do it's magic ("boring" magic stuff).equator_length / 2^zoom = visible_distance -> -> equator_length / visible_distance = 2^zoom -> -> log2(equator_length / visible_distance) = log2(2^zoom) -> (*3) -> log2(equator_length / visible_distance) = zoom*log2(2) -> (*4) -> log2(equator_length / visible_distance) = zoom*1 -> (*5) -> log2(equator_length / visible_distance) = zoom -> -> logE(equator_length / visible_distance)/logE(2) = zoom -> (*6)the zoom level formulae for an 256x256 image is:
zoom256 = logE(equator_length/visible_distance) / logE(2)Part 1 DONE!!
Resolving Part 2
Adapt the zoom to the wanted image size.
Every time that the image width doubles, the zoom needed to see the whole equator increases of one.
Example:
In an image 512x512 the zoom needed to see the whole equator is 1. In an image 1024x1024 the zoom needed to see the whole equator is 2. In an image 2048x2048 the zoom needed to see the whole equator is 3.That said
width= 256 -> 256/256 = 1 -> zoom=0 (needed to see the whole equator) width= 512 -> 512/256 = 2 -> zoom=1 (needed to see the whole equator) width=1024 -> 1024/256 = 4 -> zoom=2 (needed to see the whole equator) width=2048 -> 2048/256 = 8 -> zoom=3 (needed to see the whole equator) width=4096 -> 4096/256 = 2^4 -> zoom=4 (needed to see the whole equator) width=4096 -> 4096/256 = 2^5 -> zoom=5 (needed to see the whole equator)... width -> width/256 = 2^x -> zoom=x (needed to see the whole equator)
this means that (zoom_level is
- with an 512x512 image, the zoom needed is zoom256+1 - with an 1024x1024 image, the zoom needed is zoom256+2 - with an 2048x2048 image, the zoom needed is zoom256+3 ... - with an WIDTHxHEIGHT image, the zoom needed is zoom256+xWhe need x to adapt the zoom the the wanted image size.
So, it is a matter of extract x from
width/256 = 2^xLet's do it
width/256 = 2^x -> -> log2(width/256) = log2(2^x) -> (*3) -> log2(width/256) = x * log2(2) -> (*4) -> log2(width/256) = x * 1 -> (*5) -> log2(width/256) = x -> -> logE(width/256) / logE(2) = x -> (*6)Now we have the x formula.
the zoom level formulae for an WIDTHxHEIGHT image is:
zoom = zoom256 + xSo, if you want 1km visible in an 512x512 image than
zoom256 = logE(40075016/1000) / logE(2) = 15.29041547592718 x = logE(512/256) / logE(2) = 1 zoom = zoom256 + z = 15.29041547592718 + 1 = 16.29041547592718If it must be integer
zoom = floor(zoom) = 16DONE!
(*3) expr1=expr2 <-> log(expr1)=log(expr2) (*4) logN(a^b) = b * logN(a) (*5) logN(N) = 1 (*6) logN(expr) = log(expr)/log(N) (*7) log(a/b) = log(a) - log(b)
Here is the complete code that computes the zoom level at every latitude ed image width.
class MainClass { public static int getParallelLength(double atLatitude) { int FR_LAT = 0; // from latitude int TO_LAT = 1; // to latidude int PA_LEN = 2; // parallel length in meters) int PC_ERR = 3; // percentage error // fr_lat| to_lat | par_len| perc_err double tbl[][] = { { 0.00, 12.656250000000000, 40075016, 2.410}, {12.66, 17.402343750000000, 39107539, 2.180}, {17.40, 22.148437500000000, 38252117, 2.910}, {22.15, 25.708007812500000, 37135495, 2.700}, {25.71, 28.377685546875000, 36130924, 2.330}, {28.38, 31.047363281250000, 35285940, 2.610}, {31.05, 33.717041015625000, 34364413, 2.890}, {33.72, 35.719299316406250, 33368262, 2.380}, {35.72, 37.721557617187500, 32573423, 2.560}, {37.72, 39.723815917968750, 31738714, 2.750}, {39.72, 41.726074218750000, 30865121, 2.950}, {41.73, 43.227767944335938, 29953681, 2.360}, {43.23, 44.729461669921875, 29245913, 2.480}, {44.73, 46.231155395507812, 28517939, 2.620}, {46.23, 47.732849121093750, 27770248, 2.760}, {47.73, 49.234542846679688, 27003344, 2.900}, {49.23, 50.360813140869141, 26217745, 2.290}, {50.36, 51.487083435058594, 25616595, 2.380}, {51.49, 52.613353729248047, 25005457, 2.480}, {52.61, 53.739624023437500, 24384564, 2.580}, {53.74, 54.865894317626953, 23754152, 2.690}, {54.87, 55.992164611816406, 23114464, 2.800}, {55.99, 57.118434906005859, 22465745, 2.920}, {57.12, 57.963137626647949, 21808245, 2.280}, {57.96, 58.807840347290039, 21309508, 2.360}, {58.81, 59.652543067932129, 20806081, 2.440}, {59.65, 60.497245788574219, 20298074, 2.520}, {60.50, 61.341948509216309, 19785597, 2.610}, {61.34, 62.186651229858398, 19268762, 2.700}, {62.19, 63.031353950500488, 18747680, 2.800}, {63.03, 63.876056671142578, 18222465, 2.900}, {63.88, 64.509583711624146, 17693232, 2.250}, {64.51, 65.143110752105713, 17293739, 2.320}, {65.14, 65.776637792587280, 16892100, 2.390}, {65.78, 66.410164833068848, 16488364, 2.460}, {66.41, 67.043691873550415, 16082582, 2.530}, {67.04, 67.677218914031982, 15674801, 2.610}, {67.68, 68.310745954513550, 15265074, 2.690}, {68.31, 68.944272994995117, 14853450, 2.780}, {68.94, 69.577800035476685, 14439980, 2.870}, {69.58, 70.211327075958252, 14024715, 2.970}, {70.21, 70.686472356319427, 13607707, 2.300}, {70.69, 71.161617636680603, 13293838, 2.360}, {71.16, 71.636762917041779, 12979039, 2.430}, {71.64, 72.111908197402954, 12663331, 2.500}, {72.11, 72.587053477764130, 12346738, 2.570}, {72.59, 73.062198758125305, 12029281, 2.640}, {73.06, 73.537344038486481, 11710981, 2.720}, {73.54, 74.012489318847656, 11391862, 2.800}, {74.01, 74.487634599208832, 11071946, 2.890}, {74.49, 74.962779879570007, 10751254, 2.980}, {74.96, 75.319138839840889, 10429810, 2.310}, {75.32, 75.675497800111771, 10188246, 2.370}, {75.68, 76.031856760382652, 9946280, 2.430}, {76.03, 76.388215720653534, 9703923, 2.500}, {76.39, 76.744574680924416, 9461183, 2.560}, {76.74, 77.100933641195297, 9218071, 2.640}, {77.10, 77.457292601466179, 8974595, 2.710}, {77.46, 77.813651561737061, 8730766, 2.790}, {77.81, 78.170010522007942, 8486593, 2.880}, {78.17, 78.526369482278824, 8242085, 2.970}, {78.53, 78.793638702481985, 7997252, 2.290}, {78.79, 79.060907922685146, 7813420, 2.350}, {79.06, 79.328177142888308, 7629414, 2.410}, {79.33, 79.595446363091469, 7445240, 2.470}, {79.60, 79.862715583294630, 7260900, 2.540}, {79.86, 80.129984803497791, 7076399, 2.600}, {80.13, 80.397254023700953, 6891742, 2.680}, {80.40, 80.664523243904114, 6706931, 2.750}, {80.66, 80.931792464107275, 6521972, 2.830}, {80.93, 81.199061684310436, 6336868, 2.920}, {81.20, 81.399513599462807, 6151624, 2.250}, {81.40, 81.599965514615178, 6012600, 2.310}, {81.60, 81.800417429767549, 5873502, 2.360}, {81.80, 82.000869344919920, 5734331, 2.420}, {82.00, 82.201321260072291, 5595088, 2.480}, {82.20, 82.401773175224662, 5455775, 2.550}, {82.40, 82.602225090377033, 5316394, 2.620}, {82.60, 82.802677005529404, 5176947, 2.690}, {82.80, 83.003128920681775, 5037435, 2.770}, {83.00, 83.203580835834146, 4897860, 2.850}, {83.20, 83.404032750986516, 4758224, 2.930}, {83.40, 83.554371687350795, 4618528, 2.260}, {83.55, 83.704710623715073, 4513719, 2.320}, {83.70, 83.855049560079351, 4408878, 2.370}, {83.86, 84.005388496443629, 4304006, 2.430}, {84.01, 84.155727432807907, 4199104, 2.490}, {84.16, 84.306066369172186, 4094172, 2.560}, {84.31, 84.456405305536464, 3989211, 2.630}, {84.46, 84.606744241900742, 3884223, 2.700}, {84.61, 84.757083178265020, 3779207, 2.770}, {84.76, 84.907422114629298, 3674165, 2.850}, {84.91, 85.057761050993577, 3569096, 2.940}, {85.06, 85.170515253266785, 3464003, 2.270}, {85.17, 85.283269455539994, 3385167, 2.320}, {85.28, 85.396023657813203, 3306318, 2.380}, {85.40, 85.508777860086411, 3227456, 2.440}, {85.51, 85.621532062359620, 3148581, 2.500}, {85.62, 85.734286264632829, 3069693, 2.570}, {85.73, 85.847040466906037, 2990793, 2.630}, {85.85, 85.959794669179246, 2911882, 2.710}, {85.96, 86.072548871452454, 2832959, 2.780}, {86.07, 86.185303073725663, 2754025, 2.860}, {86.19, 86.298057275998872, 2675080, 2.950}, {86.30, 86.382622927703778, 2596124, 2.280}, {86.38, 86.467188579408685, 2536901, 2.330}, {86.47, 86.551754231113591, 2477672, 2.390}, {86.55, 86.636319882818498, 2418437, 2.440}, {86.64, 86.720885534523404, 2359197, 2.510}, {86.72, 86.805451186228311, 2299952, 2.570}, {86.81, 86.890016837933217, 2240701, 2.640}, {86.89, 86.974582489638124, 2181446, 2.710}, {86.97, 87.059148141343030, 2122186, 2.790}, {87.06, 87.143713793047937, 2062921, 2.870}, {87.14, 87.228279444752843, 2003652, 2.950}, {87.23, 87.291703683531523, 1944378, 2.280}, {87.29, 87.355127922310203, 1899919, 2.340}, {87.36, 87.418552161088883, 1855459, 2.390}, {87.42, 87.481976399867563, 1810996, 2.450}, {87.48, 87.545400638646242, 1766531, 2.510}, {87.55, 87.608824877424922, 1722063, 2.580}, {87.61, 87.672249116203602, 1677594, 2.650}, {87.67, 87.735673354982282, 1633122, 2.720}, {87.74, 87.799097593760962, 1588648, 2.790}, {87.80, 87.862521832539642, 1544172, 2.880}, {87.86, 87.925946071318322, 1499695, 2.960}, {87.93, 87.973514250402332, 1455215, 2.290}, {87.97, 88.021082429486341, 1421854, 2.340}, {88.02, 88.068650608570351, 1388493, 2.400}, {88.07, 88.116218787654361, 1355130, 2.460}, {88.12, 88.163786966738371, 1321766, 2.520}, {88.16, 88.211355145822381, 1288401, 2.580}, {88.21, 88.258923324906391, 1255036, 2.650}, {88.26, 88.306491503990401, 1221669, 2.730}, {88.31, 88.354059683074411, 1188302, 2.800}, {88.35, 88.401627862158421, 1154934, 2.880}, {88.40, 88.449196041242431, 1121565, 2.970}, {88.45, 88.484872175555438, 1088195, 2.290}, {88.48, 88.520548309868445, 1063167, 2.350}, {88.52, 88.556224444181453, 1038139, 2.410}, {88.56, 88.591900578494460, 1013110, 2.470}, {88.59, 88.627576712807468, 988081, 2.530}, {88.63, 88.663252847120475, 963052, 2.590}, {88.66, 88.698928981433482, 938022, 2.660}, {88.70, 88.734605115746490, 912992, 2.740}, {88.73, 88.770281250059497, 887961, 2.810}, {88.77, 88.805957384372505, 862930, 2.900}, {88.81, 88.841633518685512, 837899, 2.980}, {88.84, 88.868390619420268, 812867, 2.300}, {88.87, 88.895147720155023, 794093, 2.360}, {88.90, 88.921904820889779, 775319, 2.420}, {88.92, 88.948661921624534, 756545, 2.480}, {88.95, 88.975419022359290, 737771, 2.540}, {88.98, 89.002176123094046, 718996, 2.610}, {89.00, 89.028933223828801, 700221, 2.680}, {89.03, 89.055690324563557, 681446, 2.750}, {89.06, 89.082447425298312, 662671, 2.830}, {89.08, 89.109204526033068, 643896, 2.910}, {89.11, 89.129272351584135, 625121, 2.250}, {89.13, 89.149340177135201, 611039, 2.300}, {89.15, 89.169408002686268, 596957, 2.350}, {89.17, 89.189475828237335, 582876, 2.410}, {89.19, 89.209543653788401, 568794, 2.470}, {89.21, 89.229611479339468, 554712, 2.530}, {89.23, 89.249679304890535, 540630, 2.600}, {89.25, 89.269747130441601, 526548, 2.670}, {89.27, 89.289814955992668, 512466, 2.740}, {89.29, 89.309882781543735, 498384, 2.820}, {89.31, 89.329950607094801, 484302, 2.900}, {89.33, 89.350018432645868, 470219, 2.990}, {89.35, 89.365069301809172, 456137, 2.310}, {89.37, 89.380120170972475, 445575, 2.370}, {89.38, 89.395171040135779, 435013, 2.420}, {89.40, 89.410221909299082, 424451, 2.480}, {89.41, 89.425272778462386, 413889, 2.550}, {89.43, 89.440323647625689, 403328, 2.610}, {89.44, 89.455374516788993, 392766, 2.680}, {89.46, 89.470425385952296, 382204, 2.760}, {89.47, 89.485476255115600, 371642, 2.840}, {89.49, 89.500527124278904, 361080, 2.920}, {89.50, 89.511815276151381, 350518, 2.260}, {89.51, 89.523103428023859, 342596, 2.310}, {89.52, 89.534391579896337, 334674, 2.360}, {89.53, 89.545679731768814, 326753, 2.420}, {89.55, 89.556967883641292, 318831, 2.480}, {89.56, 89.568256035513770, 310910, 2.540}, {89.57, 89.579544187386247, 302988, 2.610}, {89.58, 89.590832339258725, 295066, 2.680}, {89.59, 89.602120491131203, 287145, 2.750}, {89.60, 89.613408643003680, 279223, 2.830}, {89.61, 89.624696794876158, 271301, 2.910}, {89.62, 89.633162908780520, 263380, 2.250}, {89.63, 89.641629022684882, 257438, 2.300}, {89.64, 89.650095136589243, 251497, 2.360}, {89.65, 89.658561250493605, 245556, 2.410}, {89.66, 89.667027364397967, 239615, 2.470}, {89.67, 89.675493478302329, 233673, 2.540}, {89.68, 89.683959592206691, 227732, 2.600}, {89.68, 89.692425706111052, 221791, 2.670}, {89.69, 89.700891820015414, 215849, 2.750}, {89.70, 89.709357933919776, 209908, 2.830}, {89.71, 89.717824047824138, 203967, 2.910}, {89.72, 89.724173633252406, 198026, 2.250}, {89.72, 89.730523218680673, 193570, 2.300}, {89.73, 89.736872804108941, 189114, 2.350}, {89.74, 89.743222389537209, 184658, 2.410}, {89.74, 89.749571974965477, 180202, 2.470}, {89.75, 89.755921560393745, 175746, 2.530}, {89.76, 89.762271145822012, 171290, 2.600}, {89.76, 89.768620731250280, 166834, 2.670}, {89.77, 89.774970316678548, 162378, 2.740}, {89.77, 89.781319902106816, 157922, 2.820}, {89.78, 89.787669487535084, 153466, 2.900}, {89.79, 89.794019072963351, 149010, 2.990}, {89.79, 89.798781262034552, 144554, 2.310}, {89.80, 89.803543451105753, 141212, 2.360}, {89.80, 89.808305640176954, 137869, 2.420}, {89.81, 89.813067829248155, 134527, 2.480}, {89.81, 89.817830018319356, 131185, 2.540}, {89.82, 89.822592207390556, 127843, 2.610}, {89.82, 89.827354396461757, 124501, 2.680}, {89.83, 89.832116585532958, 121159, 2.750}, {89.83, 89.836878774604159, 117817, 2.830}, {89.84, 89.841640963675360, 114475, 2.910}, {89.84, 89.845212605478764, 111133, 2.250}, {89.85, 89.848784247282168, 108627, 2.300}, {89.85, 89.852355889085572, 106120, 2.360}, {89.85, 89.855927530888977, 103614, 2.410}, {89.86, 89.859499172692381, 101107, 2.470}, {89.86, 89.863070814495785, 98601, 2.540}, {89.86, 89.866642456299189, 96094, 2.600}, {89.87, 89.870214098102593, 93588, 2.670}, {89.87, 89.873785739905998, 91081, 2.750}, {89.87, 89.877357381709402, 88575, 2.830}, {89.88, 89.880929023512806, 86068, 2.910}, {89.88, 89.883607754865352, 83562, 2.240}, {89.88, 89.886286486217898, 81682, 2.300}, {89.89, 89.888965217570444, 79802, 2.350}, {89.89, 89.891643948922990, 77922, 2.410}, {89.89, 89.894322680275536, 76042, 2.470}, {89.89, 89.897001411628082, 74162, 2.530}, {89.90, 89.899680142980628, 72282, 2.600}, {89.90, 89.902358874333174, 70402, 2.660}, {89.90, 89.905037605685720, 68523, 2.740}, {89.91, 89.907716337038266, 66643, 2.820}, {89.91, 89.910395068390812, 64763, 2.900}, {89.91, 89.913073799743358, 62883, 2.980}, {89.91, 89.915082848257768, 61003, 2.310}, {89.92, 89.917091896772178, 59593, 2.360}, {89.92, 89.919100945286587, 58183, 2.420}, {89.92, 89.921109993800997, 56773, 2.480}, {89.92, 89.923119042315406, 55363, 2.540}, {89.92, 89.925128090829816, 53953, 2.610}, {89.93, 89.927137139344225, 52543, 2.680}, {89.93, 89.929146187858635, 51134, 2.750}, {89.93, 89.931155236373044, 49724, 2.830}, {89.93, 89.933164284887454, 48314, 2.910}, {89.93, 89.934671071273257, 46904, 2.250}, {89.93, 89.936177857659061, 45846, 2.300}, {89.94, 89.937684644044865, 44789, 2.360}, {89.94, 89.939191430430668, 43731, 2.410}, {89.94, 89.940698216816472, 42674, 2.470}, {89.94, 89.942205003202275, 41617, 2.540}, {89.94, 89.943711789588079, 40559, 2.600}, {89.94, 89.945218575973882, 39502, 2.670}, {89.95, 89.946725362359686, 38444, 2.740}, {89.95, 89.948232148745490, 37387, 2.820}, {89.95, 89.949738935131293, 36329, 2.900} }; for(int r=0; r < tbl.length; r++) { double fromLat = tbl[r][FR_LAT]; double toLat = tbl[r][TO_LAT]; double atLat = atLatitude; if(fromLat <= atLat && atLat < toLat) { double parallelLength = tbl[r][PA_LEN]; return (int)parallelLength; } } return 0; } public static double calcZoom(int visible_distance, int img_width, double atLat) { // visible_distance -> in meters // img_width -> in pixels // atLat -> the latitude you want the zoom level visible_distance = Math.abs(visible_distance); double parallel_length = MainClass.getParallelLength(atLat); // in meters // for an immage of 256 pixel pixel double zoom256 = Math.log(parallel_length/visible_distance)/Math.log(2); // adapt the zoom to the image size int x = (int) (Math.log(img_width/256)/Math.log(2)); double zoom = zoom256 + x; return zoom; } public static void main(String[] args) { int len; double zoom; // equator length len = MainClass.getParallelLength(0); System.out.println("parallel length at 0: " + String.valueOf(len)); // legth parallel at latitude 89.9 (near the north pole) len = MainClass.getParallelLength(89.9); System.out.println("parallel length at 89.9: " + String.valueOf(len)); // the zoom level needed to see 100km=100000m in a img having // width 256 at equator latitude zoom = MainClass.calcZoom(100000, 256, 0); System.out.println("zoom (100km, width:256, lat:0): " + String.valueOf(zoom)); // the zoom level needed to see 100km=100000m in a img having // width 512 at equator latitude zoom = MainClass.calcZoom(100000, 512, 0); System.out.println("zoom (100km, width:512, lat:0): " + String.valueOf(zoom)); // the zoom level needed to see 100km=100000m in a img having // width 256 at latitude 60 zoom = MainClass.calcZoom(100000, 256, 60); System.out.println("zoom (100km, width:256, lat:60): " + String.valueOf(zoom)); return; } }
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