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Posted to commits@echarts.apache.org by GitBox <gi...@apache.org> on 2020/03/06 02:39:30 UTC
[GitHub] [incubator-echarts] hugetiny opened a new issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
hugetiny opened a new issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240
### Version
4.6.0
### Steps to reproduce
官方案例：https://www.echartsjs.com/examples/zh/editor.html?c=scatter3d-globe-population&gl=1中
data = data.filter(function (dataItem) {
return dataItem[2] > 0;
}).map(function (dataItem) {
return [dataItem[0], dataItem[1], Math.sqrt(dataItem[2])];
});
为什么Z坐标要只取正的而且要取平方根？来源数据X,Y轴有正负，Z都是正数
### What is expected?
请回答一下
### What is actually happening?
应该是XYZ轴都有正负，对应一个三维坐标系
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[GitHub] [incubator-echarts] pissang edited a comment on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
pissang edited a comment on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-596198987
@hugetiny 这里的 x，y 对应了经纬度，z 值是任意的数据（比如人口数量等等），echarts 会把 z 值线性映射到半径值（映射范围参考 https://www.echartsjs.com/zh/option-gl.html#globe.globeOuterRadius ），用来表示数的大小。例子里取平方根只是对这个数据做了下特殊处理，不会让数据的对比太过夸张（类似 log 轴）。可以不需要考虑这个
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[GitHub] [incubator-echarts] hugetiny commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
hugetiny commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-596203847
谢谢 了解了
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[GitHub] [incubator-echarts] pissang edited a comment on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
pissang edited a comment on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-596198987
@hugetiny 这里的 x，y 对应了经纬度，z 值是任意的数据（比如人口数量等等），echarts 会把 z 值线性映射到半径值（映射范围参考 https://www.echartsjs.com/zh/option-gl.html#globe.globeOuterRadius ），用来表示数的大小。例子里取平方根只是对这个数据做了下特殊处理，不会让数据的对比太过夸张（类似 log 轴）。可以不用考虑这个
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[GitHub] [incubator-echarts] pissang edited a comment on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
pissang edited a comment on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-596198987
@hugetiny 这里的 x，y 对应了经纬度，z 值是任意的数据（比如人口数量等等），echarts 会把 z 值线性映射到半径值（映射范围参考 https://www.echartsjs.com/zh/option-gl.html#globe.globeOuterRadius ），用来表示数的大小。例子里去平方根只是对这个数据做了下特殊处理，不会让数据的对比太过夸张（类似 log 轴）。可以不需要考虑这个
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[GitHub] [incubator-echarts] hugetiny closed issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
hugetiny closed issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240
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[GitHub] [incubator-echarts] echarts-bot[bot] commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
echarts-bot[bot] commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-595569296
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[GitHub] [incubator-echarts] pissang commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
pissang commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-596198987
@hugetiny 这里的 x，y 对应了经纬度，z 值是任意的数据（比如人口数量等等），echarts 会把 z 值线性映射到半径值（映射范围参考 https://www.echartsjs.com/zh/option-gl.html#globe.globeOuterRadius），用来表示数的大小。例子里去平方根只是对这个数据做了下特殊处理，不会让数据的对比太过夸张（类似 log 轴）。可以不需要考虑这个
----------------------------------------------------------------
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[GitHub] [incubator-echarts] Ovilia commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
Ovilia commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-595630152
负值的问题大概是因为负值表示海平面以下，而这里不准备表现海面以下的细节。
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[GitHub] [incubator-echarts] hugetiny commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
hugetiny commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-595634507
我想做一个全球covid-19的散点地球图，就卡在这里。官网找不到解释
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[GitHub] [incubator-echarts] hugetiny commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
Posted by GitBox <gi...@apache.org>.
hugetiny commented on issue #12240: 官方webgl地球案例中为什么Z坐标要只取正的而且要取平方根？
URL: https://github.com/apache/incubator-echarts/issues/12240#issuecomment-595633825
我的理解是这个并不是三维坐标系，而是地球坐标系，X,Y表示贴图平面的坐标系
Z表示从圆心出发的距离，并没有负值。海平面以下只是数字比较小。
问题就在于 普通的经纬度怎么转成这个坐标系
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