source: josm/trunk/test/unit/org/openstreetmap/josm/data/projection/ProjectionRefTest.java@ 9609

Last change on this file since 9609 was 9609, checked in by bastiK, 9 years ago

rewrite of ProjectionRefTest - now covers all projections (see #12186)
  • Property svn:eol-style set to native
File size: 13.7 KB
Line 
1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.data.projection;
3
4import java.io.BufferedReader;
5import java.io.BufferedWriter;
6import java.io.File;
7import java.io.FileInputStream;
8import java.io.FileNotFoundException;
9import java.io.FileOutputStream;
10import java.io.IOException;
11import java.io.InputStream;
12import java.io.InputStreamReader;
13import java.io.OutputStream;
14import java.io.OutputStreamWriter;
15import java.nio.charset.StandardCharsets;
16import java.util.ArrayList;
17import java.util.Arrays;
18import java.util.Collection;
19import java.util.HashMap;
20import java.util.HashSet;
21import java.util.LinkedHashSet;
22import java.util.List;
23import java.util.Map;
24import java.util.Objects;
25import java.util.Random;
26import java.util.Set;
27import java.util.TreeMap;
28import java.util.TreeSet;
29import java.util.regex.Matcher;
30import java.util.regex.Pattern;
31
32import org.junit.Assert;
33import org.junit.Test;
34import org.openstreetmap.josm.data.Bounds;
35import org.openstreetmap.josm.data.coor.EastNorth;
36import org.openstreetmap.josm.data.coor.LatLon;
37import org.openstreetmap.josm.gui.preferences.projection.CodeProjectionChoice;
38import org.openstreetmap.josm.tools.Pair;
39import org.openstreetmap.josm.tools.Utils;
40
41/**
42 * Test projections using reference data from external program.
43 *
44 * To update the reference data file <code>data_nodist/projection/projection-reference-data</code>,
45 * run the main method of this class. For this, you need to have the cs2cs
46 * program from the proj.4 library in path (or use <code>CS2CS_EXE</code> to set
47 * the full path of the executable). Make sure the required *.gsb grid files
48 * can be accessed, i.e. copy them from <code>data/projection</code> to <code>/usr/share/proj</code> or
49 * wherever cs2cs expects them to be placed.
50 *
51 * The input parameter for the external library is <em>not</em> the projection code
52 * (e.g. "EPSG:25828"), but the entire definition, (e.g. "+proj=utm +zone=28 +ellps=GRS80 +nadgrids=null").
53 * This means the test does not verify our definitions, but the correctness
54 * of the algorithm, given a certain definition.
55 */
56public class ProjectionRefTest {
57
58 private static final String CS2CS_EXE = "cs2cs";
59
60 private static final String REFERENCE_DATA_FILE = "data_nodist/projection/projection-reference-data";
61
62 private static class RefEntry {
63 String code;
64 String def;
65 List<Pair<LatLon, EastNorth>> data;
66
67 public RefEntry(String code, String def) {
68 this.code = code;
69 this.def = def;
70 this.data = new ArrayList<>();
71 }
72 }
73
74 static Random rand = new Random();
75
76 public static void main(String[] args) throws FileNotFoundException, IOException {
77 Collection<RefEntry> refs = readData();
78 refs = updateData(refs);
79 writeData(refs);
80 }
81
82 /**
83 * Reads data from the reference file.
84 * @return the data
85 * @throws IOException
86 * @throws FileNotFoundException
87 */
88 private static Collection<RefEntry> readData() throws IOException, FileNotFoundException {
89 Collection<RefEntry> result = new ArrayList<>();
90 if (!new File(REFERENCE_DATA_FILE).exists()) {
91 System.err.println("Warning: refrence file does not exist.");
92 return result;
93 }
94 try (BufferedReader in = new BufferedReader(new InputStreamReader(
95 new FileInputStream(REFERENCE_DATA_FILE), StandardCharsets.UTF_8))) {
96 String line;
97 Pattern projPattern = Pattern.compile("<(.+?)>(.*)<>");
98 RefEntry curEntry = null;
99 while ((line = in.readLine()) != null) {
100 if (line.startsWith("#") || line.trim().isEmpty()) {
101 continue;
102 }
103 if (line.startsWith("<")) {
104 Matcher m = projPattern.matcher(line);
105 if (!m.matches()) {
106 Assert.fail("unable to parse line: " + line);
107 }
108 String code = m.group(1);
109 String def = m.group(2).trim();
110 curEntry = new RefEntry(code, def);
111 result.add(curEntry);
112 } else if (curEntry != null) {
113 String[] f = line.trim().split(",");
114 double lon = Double.parseDouble(f[0]);
115 double lat = Double.parseDouble(f[1]);
116 double east = Double.parseDouble(f[2]);
117 double north = Double.parseDouble(f[3]);
118 curEntry.data.add(Pair.create(new LatLon(lat, lon), new EastNorth(east, north)));
119 }
120 }
121 }
122 return result;
123 }
124
125 /**
126 * Generates new reference data by calling external program cs2cs.
127 *
128 * Old data is kept, as long as the projection definition is still the same.
129 *
130 * @param refs old data
131 * @return updated data
132 */
133 private static Collection<RefEntry> updateData(Collection<RefEntry> refs) {
134 Set<String> failed = new LinkedHashSet<>();
135 final int N_POINTS = 20;
136
137 Map<String, RefEntry> refsMap = new HashMap<>();
138 for (RefEntry ref : refs) {
139 refsMap.put(ref.code, ref);
140 }
141
142 List<RefEntry> refsNew = new ArrayList<>();
143
144 Set<String> codes = new TreeSet<>(new CodeProjectionChoice.CodeComparator());
145 codes.addAll(Projections.getAllProjectionCodes());
146 for (String code : codes) {
147 String def = Projections.getInit(code);
148
149 RefEntry ref = new RefEntry(code, def);
150 RefEntry oldRef = refsMap.get(code);
151
152 if (oldRef != null && Objects.equals(def, oldRef.def)) {
153 for (int i = 0; i < N_POINTS && i < oldRef.data.size(); i++) {
154 ref.data.add(oldRef.data.get(i));
155 }
156 }
157 if (ref.data.size() < N_POINTS) {
158 System.out.print(code);
159 System.out.flush();
160 Projection proj = Projections.getProjectionByCode(code);
161 Bounds b = proj.getWorldBoundsLatLon();
162 for (int i = ref.data.size(); i < N_POINTS; i++) {
163 System.out.print(".");
164 System.out.flush();
165 LatLon ll = getRandom(b);
166 EastNorth en = latlon2eastNorthProj4(def, ll);
167 if (en != null) {
168 ref.data.add(Pair.create(ll, en));
169 } else {
170 System.err.println("Warning: cannot convert "+code+" at "+ll);
171 failed.add(code);
172 }
173 }
174 System.out.println();
175 }
176 refsNew.add(ref);
177 }
178 if (!failed.isEmpty()) {
179 System.err.println("Error: the following " + failed.size() + " entries had errors: " + failed);
180 }
181 return refsNew;
182 }
183
184 /**
185 * Get random LatLon value within the bounds.
186 * @param b the bounds
187 * @return random LatLon value within the bounds
188 */
189 private static LatLon getRandom(Bounds b) {
190 double lat, lon;
191 lat = b.getMin().lat() + rand.nextDouble() * (b.getMax().lat() - b.getMin().lat());
192 double minlon = b.getMinLon();
193 double maxlon = b.getMaxLon();
194 if (b.crosses180thMeridian()) {
195 maxlon += 360;
196 }
197 lon = minlon + rand.nextDouble() * (maxlon - minlon);
198 lon = LatLon.toIntervalLon(lon);
199 return new LatLon(lat, lon);
200 }
201
202 /**
203 * Run external cs2cs command from the PROJ.4 library to convert lat/lon to
204 * east/north value.
205 * @param def the proj.4 projection definition string
206 * @param ll the LatLon
207 * @return projected EastNorth or null in case of error
208 */
209 private static EastNorth latlon2eastNorthProj4(String def, LatLon ll) {
210 List<String> args = new ArrayList<>();
211 args.add(CS2CS_EXE);
212 args.addAll(Arrays.asList("-f %.9f +proj=longlat +datum=WGS84 +to".split(" ")));
213 // proj.4 cannot read our ntf_r93_b.gsb file
214 // possibly because it is big endian. Use equivalent
215 // little endian file shipped with proj.4.
216 // see http://geodesie.ign.fr/contenu/fichiers/documentation/algorithmes/notice/NT111_V1_HARMEL_TransfoNTF-RGF93_FormatGrilleNTV2.pdf
217 def = def.replace("ntf_r93_b.gsb", "ntf_r93.gsb");
218 args.addAll(Arrays.asList(def.split(" ")));
219 ProcessBuilder pb = new ProcessBuilder(args);
220
221 String output;
222 try {
223 Process process = pb.start();
224 OutputStream stdin = process.getOutputStream();
225 final BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(stdin));
226 InputStream stdout = process.getInputStream();
227 final BufferedReader reader = new BufferedReader(new InputStreamReader(stdout));
228 String input = String.format("%.9f %.9f\n", ll.lon(), ll.lat());
229 writer.write(input);
230 writer.close();
231 output = reader.readLine();
232 reader.close();
233 } catch (IOException e) {
234 System.err.println("Error: Running external command failed: " + e + "\nCommand was: "+Utils.join(" ", args));
235 return null;
236 }
237 Pattern p = Pattern.compile("(\\S+)\\s+(\\S+)\\s.*");
238 Matcher m = p.matcher(output);
239 if (!m.matches()) {
240 System.err.println("Error: Cannot parse cs2cs output: '" + output + "'");
241 return null;
242 }
243 String es = m.group(1);
244 String ns = m.group(2);
245 if ("*".equals(es) || "*".equals(ns)) {
246 System.err.println("Error: cs2cs is unable to convert coordinates.");
247 return null;
248 }
249 try {
250 return new EastNorth(Double.parseDouble(es), Double.parseDouble(ns));
251 } catch (NumberFormatException nfe) {
252 System.err.println("Error: Cannot parse cs2cs output: '" + es + "', '" + ns + "'" + "\nCommand was: "+Utils.join(" ", args));
253 return null;
254 }
255 }
256
257 /**
258 * Writes data to file.
259 * @param refs the data
260 * @throws FileNotFoundException
261 * @throws IOException
262 */
263 private static void writeData(Collection<RefEntry> refs) throws FileNotFoundException, IOException {
264 Map<String, RefEntry> refsMap = new TreeMap<>(new CodeProjectionChoice.CodeComparator());
265 for (RefEntry ref : refs) {
266 refsMap.put(ref.code, ref);
267 }
268 try (BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
269 new FileOutputStream(REFERENCE_DATA_FILE), StandardCharsets.UTF_8))) {
270 for (Map.Entry<String, RefEntry> e : refsMap.entrySet()) {
271 RefEntry ref = e.getValue();
272 out.write("<" + ref.code + "> " + ref.def + " <>\n");
273 for (Pair<LatLon, EastNorth> p : ref.data) {
274 LatLon ll = p.a;
275 EastNorth en = p.b;
276 out.write(" " + ll.lon() + "," + ll.lat() + "," + en.east() + "," + en.north() + "\n");
277 }
278 }
279 }
280 }
281
282 @Test
283 public void test() throws IOException {
284 StringBuilder fail = new StringBuilder();
285 Set<String> allCodes = new HashSet<>(Projections.getAllProjectionCodes());
286 Collection<RefEntry> refs = readData();
287
288 for (RefEntry ref : refs) {
289 String def0 = Projections.getInit(ref.code);
290 if (def0 == null) {
291 Assert.fail("unkown code: "+ref.code);
292 }
293 if (!ref.def.equals(def0)) {
294 Assert.fail("definitions for " + ref.code + " do not match");
295 }
296 Projection proj = Projections.getProjectionByCode(ref.code);
297 double scale = proj.getMetersPerUnit();
298 for (Pair<LatLon, EastNorth> p : ref.data) {
299 LatLon ll = p.a;
300 EastNorth enRef = p.b;
301 enRef = new EastNorth(enRef.east() * scale, enRef.north() * scale); // convert to meter
302
303 EastNorth en = proj.latlon2eastNorth(ll);
304 if (proj.switchXY()) {
305 en = new EastNorth(en.north(), en.east());
306 }
307 final double EPSILON_EN = 1e-2; // 1cm
308 if (!isEqual(enRef, en, EPSILON_EN, true)) {
309 String errorEN = String.format("%s (%s): Projecting latlon(%s,%s):%n" +
310 " expected: eastnorth(%s,%s),%n" +
311 " but got: eastnorth(%s,%s)!%n",
312 proj.toString(), proj.toCode(), ll.lat(), ll.lon(), enRef.east(), enRef.north(), en.east(), en.north());
313 fail.append(errorEN);
314 }
315 }
316 allCodes.remove(ref.code);
317 }
318 if (!allCodes.isEmpty()) {
319 Assert.fail("no reference data for following projections: "+allCodes);
320 }
321 if (fail.length() > 0) {
322 System.err.println(fail.toString());
323 throw new AssertionError(fail.toString());
324 }
325 }
326
327 /**
328 * Check if two EastNorth objects are equal.
329 * @param en1 first value
330 * @param en2 second value
331 * @param epsilon allowed tolerance
332 * @param abs true if absolute value is compared; this is done as long as
333 * advanced axis configuration is not supported in JOSM
334 * @return true if both are considered equal
335 */
336 private static boolean isEqual(EastNorth en1, EastNorth en2, double epsilon, boolean abs) {
337 double east1 = en1.east();
338 double north1 = en1.north();
339 double east2 = en2.east();
340 double north2 = en2.north();
341 if (abs) {
342 east1 = Math.abs(east1);
343 north1 = Math.abs(north1);
344 east2 = Math.abs(east2);
345 north2 = Math.abs(north2);
346 }
347 return Math.abs(east1 - east2) < epsilon && Math.abs(north1 - north2) < epsilon;
348 }
349}
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