I want to create a gradual increase in colour dependant on the height value in the ASC file.
Thanks
Andy
Question
Ordnance Survey DTM - how to colour
+10- Contributor
Can anyone tell me how to colour the values of height data supplied by the Ordnance Survey in the Terrain 50 data in ASC format.
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+15- Contributor
create R,G,B with expressions.
I make These Parameters, so i can choose a color.
Then i create a expressioon that uses height.
Depening on speed of colour increase u can use linear, cubic etc. algorithms.
U also need to normalize them ( for instance fme_c0lor is between 0 and 1 float)
Here is an example:
The GS_Function attribute holds the output for a algorithm. I create a couple algorithms and put them in a userchoicelist. R,G,B are also parameter, so u can use the wheel to choose a startingcolor.
It creates the sunnysky in this pic.
+40- Contributor
I use a RasterBandInterpretationCoercer to coerce it to UNIT8, scaling by by data values, use the AttributeCreator to create a palette and then The RasterPaletteAdder to add the palette to the raster, then the RasterPaletteResolver to turn it into an RGB raster
The palette i use for elevation is below. The zero value entry is a special case I use for NoData
RGB24
0 0,0,0
1 118,219,211
2 125,220,210
3 129,221,210
4 132,222,209
5 136,223,209
6 140,224,209
7 143,225,208
8 147,226,208
9 151,227,208
10 155,228,207
11 158,229,207
12 162,230,207
13 166,231,206
14 169,232,206
15 173,233,206
16 177,234,205
17 180,235,205
18 184,236,205
19 188,237,204
20 192,238,204
21 195,239,204
22 199,240,203
23 203,241,203
24 206,242,203
25 210,243,202
26 214,244,202
27 217,245,202
28 221,246,201
29 225,247,201
30 229,248,201
31 232,249,200
32 236,250,200
33 240,251,200
34 243,252,199
35 247,253,199
36 251,254,199
37 255,255,199
38 255,255,197
39 255,255,195
40 255,255,193
41 255,255,191
42 255,255,189
43 255,255,187
44 255,255,185
45 255,255,183
46 255,255,181
47 255,255,179
48 255,255,177
49 255,255,175
50 255,255,174
51 255,255,172
52 255,255,170
53 255,255,168
54 255,255,166
55 255,255,164
56 255,255,162
57 255,255,160
58 255,255,158
59 255,255,156
60 255,255,154
61 255,255,152
62 255,255,151
63 255,255,149
64 255,255,147
65 255,255,145
66 255,255,143
67 255,255,141
68 255,255,139
69 255,255,137
70 255,255,135
71 255,255,133
72 255,255,131
73 255,255,129
74 255,255,128
75 253,253,127
76 252,251,127
77 251,250,127
78 250,248,127
79 249,246,127
80 248,245,126
81 247,243,126
82 246,241,126
83 245,240,126
84 244,238,126
85 243,236,125
86 242,235,125
87 241,233,125
88 240,231,125
89 239,230,125
90 238,228,124
91 237,226,124
92 236,225,124
93 235,223,124
94 234,222,124
95 233,220,124
96 232,218,123
97 231,217,123
98 230,215,123
99 229,213,123
100 228,212,123
101 227,210,122
102 226,208,122
103 225,207,122
104 224,205,122
105 223,203,122
106 222,202,121
107 221,200,121
108 220,198,121
109 219,197,121
110 218,195,121
111 217,194,121
112 214,191,118
113 212,188,116
114 210,186,114
115 208,183,112
116 205,180,109
117 203,178,107
118 201,175,105
119 199,172,103
120 197,170,100
121 194,167,98
122 192,164,96
123 190,162,94
124 188,159,91
125 185,156,89
126 183,154,87
127 181,151,85
128 179,148,82
129 177,146,80
130 174,143,78
131 172,141,76
132 170,138,73
133 168,135,71
134 166,133,69
135 163,130,67
136 161,127,64
137 159,125,62
138 157,122,60
139 154,119,58
140 152,117,55
141 150,114,53
142 148,111,51
143 146,109,49
144 143,106,46
145 141,103,44
146 139,101,42
147 137,98,40
148 135,96,38
149 135,97,41
150 135,98,45
151 136,100,49
152 136,101,53
153 137,103,57
154 137,104,61
155 137,106,65
156 138,107,68
157 138,109,72
158 139,110,76
159 139,112,80
160 139,113,84
161 140,114,88
162 140,116,92
163 141,117,95
164 141,119,99
165 141,120,103
166 142,122,107
167 142,123,111
168 143,125,115
169 143,126,119
170 143,128,123
171 144,129,126
172 144,131,130
173 145,132,134
174 145,133,138
175 145,135,142
176 146,136,146
177 146,138,150
178 147,139,153
179 147,141,157
180 147,142,161
181 148,144,165
182 148,145,169
183 149,147,173
184 149,148,177
185 150,150,181
186 150,150,181
187 151,150,181
188 152,150,181
189 153,150,181
190 154,150,181
191 155,150,181
192 155,150,181
193 156,150,181
194 157,150,181
195 158,150,181
196 159,150,181
197 160,150,181
198 160,150,181
199 161,150,181
200 162,150,181
201 163,150,181
202 164,150,181
203 165,150,181
204 165,150,181
205 166,150,181
206 167,150,181
207 168,150,181
208 169,150,181
209 170,150,181
210 170,150,181
211 171,150,181
212 172,150,181
213 173,150,181
214 174,150,181
215 175,150,181
216 175,150,181
217 176,150,181
218 177,150,181
219 178,150,181
220 179,150,181
221 180,150,181
222 181,150,181
223 183,153,183
224 185,156,185
225 187,159,187
226 189,162,189
227 192,165,192
228 194,169,194
229 196,172,196
230 198,175,198
231 201,178,201
232 203,181,203
233 205,185,205
234 207,188,207
235 210,191,210
236 212,194,212
237 214,197,214
238 216,200,216
239 219,204,219
240 221,207,221
241 223,210,223
242 225,213,225
243 228,216,228
244 230,220,230
245 232,223,232
246 234,226,234
247 237,229,237
248 239,232,239
249 241,235,241
250 243,239,243
251 246,242,246
252 248,245,248
253 250,248,250
254 252,251,252
255 255,255,255