Add GPS coordinate as wgs84 tag

They have clashing meanings. And there's no need to have gps coordinates at different resolutions. That's what geohash is good for.

This commits drop the GPS coordinate entirely, the next commit brings it back in a different way.

main.ts

@@ -54,7 +54,7 @@ const relay = new NRelay1(relay_str);
 
 console.log("\nAs a sanity check, here's your last message (if any):");
 
-for await (const msg of relay.req([{ kinds: [1], limit: 960, authors: [pubkey_hex] }])) {
+for await (const msg of relay.req([{ kinds: [1], limit: 1, authors: [pubkey_hex] }])) {
     if (msg[0] === 'EVENT') console.log(msg[2].content);
     if (msg[0] === 'EOSE') break;
 }
@@ -92,6 +92,7 @@ for (const i in posts) {
 
     // Populated from the first media item with coordinates
     let geotags;
+    let event_tags: string[][] = [];
 
     let first = true;
     for (const j in post.media) {
@@ -139,23 +140,27 @@ for (const i in posts) {
 
         if (geotags == undefined && media.media_metadata && media.media_metadata.photo_metadata) {
             const options = {
-                geohash: true,
+                geohash: true, // l tag per NIP-52, adds multiple tags at decreasing resolution
-                gps: true,
+                gps: false,    // Avoid multiple tags, insert them manually below.
                 city: false,
                 iso31662: false,
-                iso31662: false,
                 iso31663: false
             };
 
-            let exif_data = media.media_metadata.photo_metadata.exif_data;
+            const exif_data = media.media_metadata.photo_metadata.exif_data;
             if (exif_data) {
                 for (const k in exif_data) {
                     const exif_item = exif_data[k];
                     if (exif_item.latitude != undefined && exif_item.latitude != undefined) {
-                        geotags = ngeotags({
+                        // Add coordinates as a tag.
+                        // There is currently no NIP defining a wgs84 tag!
+                        event_tags.push(['wgs84', String(exif_item.latitude), String(exif_item.longitude)])
+                        // Encode coordinates as Geohash in different resolutions:
+                        // https://en.wikipedia.org/wiki/Geohash
+                        event_tags = [...event_tags, ...ngeotags({
                             lat: exif_item.latitude,
                             lon: exif_item.longitude
-                        }, options);
+                        }, options)];
                     }
                 }
             }
@@ -166,15 +171,12 @@ for (const i in posts) {
     let event = {
         kind: 1,
         content: message,
-        tags: [],
+        tags: event_tags,
         created_at: created_at
     }
-    if (geotags != undefined) {
-        event.tags = [...event.tags, ...geotags];
-    }
     const signed_event = await signer.signEvent(event);
-    console.log(event);
+    console.log(signed_event);
-    events.push(event);
+    events.push(signed_event);
 
     completed++;
     if (completed == n) break;
@@ -182,9 +184,10 @@ for (const i in posts) {
 
 alert("About to post to Nostr.");
 
-for (const event in events) {
+for (const i in events) {
-    console.log(event);
+    const event = events[i]
-    console.log(await relay.event(event));
+    await relay.event(event);
+    console.log(event.id);
 }
 
 await relay.close()